| 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 settings specified in CameraParameters. Only one VideoCapture instance can start the video mode at any given time. After starting the video mode, you can record videos via VideoCapture.StartRecordingAsync. Video mode can impact performance, so make sure to call VideoCapture.StopVideoModeAsync when you are done recording.