使用OPENCV库实现的人脸跟踪，需要安装OPENCV。输入源可以是视频，也可以是摄像头。可选择Harr特征和CamShift两种方法对人脸进行跟踪。还提供了视频保存的功能。-Library implemented using OPENCV Face Tracking, need to install OPENCV. Input source can be a video camera can also be. Harr features and CamShift choose two meth