Personally I think that would be a great idea. But from my (non expert) perspective, for eye contact in video calls, I'd have thought a single camera behind a transparent 30" monitor would be little better than a single camera ontop of a 30" monitor, given that you may have multiple faces on screen and have those faces in different places on screen. Maybe a matrix of cameras behind a transparent screen, with gaze detection and eye tracking to determine which to activate at any time?