1.调用DirectShow查询UVC设备信息； 2.调用OpenCV打开设备，设置视频流参数，读取视频流，录制视频，播放视频； 3.计算帧率；(1. Call DirectShow search UVC information; 2. Call OpenCV to open the device, set the video stream parameters, read the video stream, record video, play video; 3. Calculate