Step 1： 
Step 2：
导入有用的framework
opencv2.framework需要自己下载
opencv2.framework如下导入方式 
其他 .framework如下方式导入 
导入framework后如下图所示 
Step 3：
下图1的位置将.m文件改为.mm文件 
Step 4：
添加protocol
这个delegate可以用来出来获取的视频图像
Step 5：创建一个CvVideoCamera的实例
@property (nonatomic,strong) CvVideoCamera *videoCamera;
Step 6：将videoCamera对象与imageView连接：
self.videoCamera = [[CvVideoCamera alloc] initWithParentView:self.imageView];
self.videoCamera.delegate = self;
self.videoCamera.defaultAVCaptureDevicePosition = AVCaptureDevicePositionBack;//调用摄像头前置或者后置
self.videoCamera.defaultAVCaptureSessionPreset = AVCaptureSessionPreset640x480;//设置图像分辨率
self.videoCamera.rotateVideo=YES;// 解决图像显示旋转90°问题
self.videoCamera.grayscaleMode = NO;//获取图像是灰度还是彩色图像
self.videoCamera.defaultFPS = 30;//摄像头频率
只要简单的设置，现在videoCamera已经就绪了，只需要以下命令：
[self.videoCamera start];
[self.videoCamera stop];
进行控制
Step 7：对获取的实时图像进行处理
利用protocol的method：
-(void)processImage:(cv::Mat &)image {
//添加自己的图像处理算法
if (!image.empty()) {
if(image.channels()==4)
{ cv::Mat gray;
cv::cvtColor(image, gray, CV_BGRA2GRAY);
cv::GaussianBlur(gray, gray, cv::Size(5,5), 1.2, 1.2);
cv::Mat edges;
cv::Canny(gray, edges, 0, 60);
image.setTo(cv::Scalar::all(255));
image.setTo(cv::Scalar(0,128,255,255), edges);
self.imageView.image = MatToUIImage(image);
}else if(image.channels()==3)
{
cv::Mat gray;
cv::cvtColor(image, gray, CV_RGB2GRAY);
cv::GaussianBlur(gray, gray, cv::Size(5,5), 1.2, 1.2);
cv::Mat edges;
cv::Canny(gray, edges, 0, 60);
image.setTo(cv::Scalar::all(255));
image.setTo(cv::Scalar(0,128,255,255), edges);
self.imageView.image = MatToUIImage(image);
}
else if(image.channels()==1){
cv::Mat gray;
cv::GaussianBlur(image, gray, cv::Size(5,5), 1.2, 1.2);
cv::Mat edges;
cv::Canny(gray, edges, 0, 60);
image.setTo(cv::Scalar::all(255));
image.setTo(cv::Scalar(0,128,255,255), edges);
self.imageView.image = MatToUIImage(image);
}
else{
}
}
} 
有时会出现如下错误
ld: ‘/Users///*/opencv2.framework/opencv2(cap_ios_video_camera.o)’ does not contain bitcode. You must rebuild it with bitcode enabled (Xcode setting ENABLE_BITCODE), obtain an updated library from the vendor, or disable bitcode for this target. for architecture arm64
Build Phases 收索bit code 将Enable Bitcode 后面的Yes改为No。
