| setupParams | 应该应用到网络摄像机的各种设置。 |
| audioState | 指示应如何录制音频。 |
| onVideoModeStartedCallback | 将在视频模式激活后调用此回调。 |
异步启动视频模式。
Activates the web camera with the various settings specified in CameraParameters. Only one VideoCapture instance can start the video mode at any given time. After starting the video mode, you make record videos via VideoCapture.StartRecordingAsync. While in video mode, more power will be consumed so make sure that you call VideoCapture.StopVideoModeAsync when you are recording.