废话不多说，直接上代码，关于这个需求，我写了一个android的版本，根据公司业务介绍，还需要一个ios版本，直接上代码：//
// ViewController.m
// 实时视频Demo
//
// Created by yanliang.zhao on 17/5/4.
// Copyright (c) 2017年 nightGroup. All rights reserved.
//

import "ViewController.h"

import <AVFoundation/AVFoundation.h>

@interface ViewController ()<AVCaptureVideoDataOutputSampleBufferDelegate>

@end

@implementation ViewController

• (void)viewDidLoad {
  [super viewDidLoad];
  UIButton *videoBtn = [UIButton buttonWithType:UIButtonTypeCustom];
  videoBtn.frame = CGRectMake(0, 0, 100, 50);
  videoBtn.center = self.view.center;
  [videoBtn setTitle:@"视频流" forState:UIControlStateNormal];
  [videoBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
  [videoBtn addTarget:self action:@selector(videoBtnAction) forControlEvents:UIControlEventTouchUpInside];
  [self.view addSubview:videoBtn];
  // Do any additional setup after loading the view, typically from a nib.
  //[self videoBtnAction];

}

//创建并配置一个捕获会话并启用它

• (void)videoBtnAction
  {
  //捕获视频流的方法写在这里
  NSError *error = nil;

  // Create the session创建session
  AVCaptureSession *session = [[AVCaptureSession alloc] init];//负责输入和输出设置之间的数据传递

  // Configure the session to produce lower resolution video frames, if your
  // processing algorithm can cope. We'll specify medium quality for the
  // chosen device.可以配置session以产生解析度较低的视频帧，如果你的处理算法能够应付（这种低解析度）
  //我们将选择的设备指定为高质量
  session.sessionPreset = AVCaptureSessionPresetMedium;//设置分辨率

  // Find a suitable AVCaptureDevice找到一个合适的AVCaptureDevice
  AVCaptureDevice *device = [AVCaptureDevice
  defaultDeviceWithMediaType:AVMediaTypeVideo];//这里默认是使用后置摄像头，你可以改成前置摄像头

  // Create a device input with the device and add it to the session.
  //找到一个合适的AVCaptureDevice
  AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device
  error:&error];
  if (!input) {
  // Handling the error appropriately.处理相应的错误
  }
  [session addInput:input];

  // Create a VideoDataOutput and add it to the session创建一个VideoDataOutput对象，将其添加到session
  AVCaptureVideoDataOutput *output = [[AVCaptureVideoDataOutput alloc] init];//创建一个视频数据输出流
  [session addOutput:output];

  // Configure your output.配置output对象
  dispatch_queue_t queue = dispatch_queue_create("myQueue", NULL);
  [output setSampleBufferDelegate:self queue:queue];
  // Specify the pixel format指定像素格式
  output.videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
  [NSNumber numberWithInt:kCVPixelFormatType_32BGRA], kCVPixelBufferPixelFormatTypeKey,
  [NSNumber numberWithInt: 1920], (id)kCVPixelBufferWidthKey,
  [NSNumber numberWithInt: 1080], (id)kCVPixelBufferHeightKey,nil];

  AVCaptureVideoPreviewLayer* preLayer = [AVCaptureVideoPreviewLayer layerWithSession: session];//相机拍摄预览图层
  //preLayer = [AVCaptureVideoPreviewLayer layerWithSession:session];
  preLayer.frame = CGRectMake(0, 0, 1920, 1080);
  preLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
  [self.view.layer addSublayer:preLayer];
  // If you wish to cap the frame rate to a known value, such as 15 fps, set
  // minFrameDuration.
  //如果你想将视频的帧数指定一个顶值，例如15fps
  //可以设置minFrameDuration(该属性在ios5.0中启用)

  output.minFrameDuration = CMTimeMake(1, 30);

  // Start the session running to start the flow of data启动session以启动数据流
  [session startRunning];

  // Assign session to an ivar.将session赋给实例变量
  //[self setSession:session];

}

// Delegate routine that is called when a sample buffer was written
// 抽样缓存写入时所调用的委托程序

• (void)captureOutput:(AVCaptureOutput *)captureOutput
  didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
  fromConnection:(AVCaptureConnection *)connection
  {
  // Create a UIImage from the sample buffer data 通过抽样缓冲数据创建一个UIImage对象
  UIImage *image = [self imageFromSampleBuffer:sampleBuffer];
  //--此处添加使用该image对象的代码-->
  NSData mData = UIImageJPEGRepresentation(image, 0.5);
  UInt64 recordTime = [[NSDate date] timeIntervalSince1970]1000;
  NSLog(@"%llu", recordTime);

  NSDateFormatter * formatter = [[NSDateFormatter alloc] init];
  [formatter setDateFormat:@"YYYY-MM-dd hh:mm:ss:SSS"];
  NSString *date = [formatter stringFromDate:[NSDate date]];
  NSString *timeLocal = [[NSString alloc] initWithFormat:@"%@", date];
  NSLog(@"%@", timeLocal);

}

// Create a UIImage from sample buffer data
//通过抽样缓存数据创建一个UIImage对象

• (UIImage *) imageFromSampleBuffer:(CMSampleBufferRef) sampleBuffer
  {
  // Get a CMSampleBuffer's Core Video image buffer for the media data
  //为媒体数据设置一个CMSampleBuffer的Core Video图像缓存对象
  CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
  // Lock the base address of the pixel buffer锁定pixel buffer的基地址
  CVPixelBufferLockBaseAddress(imageBuffer, 0);

  // Get the number of bytes per row for the pixel buffer得到pixel buffer的基地址
  void *baseAddress = CVPixelBufferGetBaseAddress(imageBuffer);

  // Get the number of bytes per row for the pixel buffer得到pixel buffer的行字节数
  size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);
  // Get the pixel buffer width and height得到pixel buffer的宽和高
  size_t width = CVPixelBufferGetWidth(imageBuffer);
  size_t height = CVPixelBufferGetHeight(imageBuffer);

  // Create a device-dependent RGB color space创建一个依赖于设备的rgb颜色空间
  CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

  // Create a bitmap graphics context with the sample buffer data用抽样缓存的数据创建一个位图格式的图形上下文（graphics context）对象
  CGContextRef context = CGBitmapContextCreate(baseAddress, width, height, 8,
  bytesPerRow, colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst);
  // Create a Quartz image from the pixel data in the bitmap graphics context根据这个位图的context中的像素数据创建一个Quartz image对象
  CGImageRef quartzImage = CGBitmapContextCreateImage(context);
  // Unlock the pixel buffer解锁pixel buffer
  CVPixelBufferUnlockBaseAddress(imageBuffer,0);

  // Free up the context and color space释放context和颜色空间
  CGContextRelease(context);
  CGColorSpaceRelease(colorSpace);

  // Create an image object from the Quartz image用Quartz image创建一个UIImage对象image
  UIImage *image = [UIImage imageWithCGImage:quartzImage];

  // Release the Quartz image释放Quartz image对象
  CGImageRelease(quartzImage);

  return (image);
  }

• (void)didReceiveMemoryWarning {
  [super didReceiveMemoryWarning];
  // Dispose of any resources that can be recreated.
  }

@end