start Capture
仅打开本地摄像头
在通话建立(IRongCallListener#onCallConnected)之后打开摄像头,对端不会收到 IRongCallListener#onRemoteCameraDisabled 通知
See also
IRong Call Listener#on Call Connected(Rong Call Session, Surface View)
IRong Call Listener#on Remote Camera Disabled(String, boolean)