matlab调用摄像头实现录像功能，并保存文件。 GUI界面。注意不同的笔记本或外置摄像头可能要更改参数-matlab realize the video call camera function, and save the file. GUI interface. Note that different notebook or external camera may want to change the parameters

创造一个交互式界面，打开USB摄像头，显示摄像头视频并采集视频(Create an interactive interface, open the USB camera, display video of the camera and collect video)