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代码说明：

说明：  实现设备摄像头动态人脸识别功能。必须用真机测试，测试时，如果在摄像头中识别到人脸，会在人脸位置出现红色方形框。可以识别现实真人脸或者照片人脸。(Realization of the device camera dynamic face recognition. Must use the real test, the test, if the recognition to the face in the camera, will appear in red square box in the face position. Can recognize the real face or face. )