Awesome idea. The main reason things like this are inferior to actually looking through a window at the other person is that you have no eye contact. You either look at the camera (causing the image on their screen to look directly at them) or you look at their eyes on the screen (causing the image to look away). Humans are very good at seeing these subtle shifts in gaze, and this is what happens in videoconferencing settings. It's possible to work around this, but to do it you have to mount the camera on the same optical axis as the screen. It has been done with one-way mirrors and beamsplitters before, and it's disgustingly realistic. Would be very interesting to have that sort of window to someone.