startPreview
Starts audio and video capture. BaseStreamer.configure must have been called at least once.
Inside, it launches both camera and microphone capture.
Parameters
previewSurface
Where to display camera capture. Could be a Surface from a SurfaceView or a TextureView.
cameraId
camera id (get camera id list from Context.cameraList)
See also
Throws
if audio or video capture couldn't be launch