Android WOWZCameraView - need to modify frames and publish modified frames

I am using WOWZCameraView and would like a way to a) access the individual frames,
b) modify the frames (I’m using OpenCV to process images), and c) write the modified
frames back to the WOWZCameraView to be broadcasted. I’ve looked at
WOWZRenderAPI.VideoFrameListener, but not sure how to do c).

Is this possible? If yes, could you please provide some sample code (for example,
change the captured frame to grey, and render the grey frame for broadcasting).

I understand that in iOS, this is fairly straightforward using WOWZVideoSink.