Unfortunately this is still not supported behavior since it will adversely impact the visibility of the video being rendered.
That being said, MobileRTCVideoView extends RelativeLayout, so you should be able to use the same approach as you would with a RelativeLayout. Since this behavior would be specific to your custom UI implementation and not related to any direct usages of the SDK, it is outside of the scope of what we can assist with. If you are still running into issues, I would recommend looking into the official Android documentation or a site like StackOverflow.