I have no interest in watching to video either, but I can clue you in on the mirror's purpose at least. Normally the camera looks straight out at the user. They

I have no interest in watching to video either, but I can clue you in on the mirror's purpose at least. Normally the camera looks straight out at the user. They need the camera to look down at the table/floor/play surface. The on screen games depend on the app being able to see where you place each piece. Without the mirror the camera wouldn't be pointing at the pieces.