Liked it
I'm working in something simillar, I was thinking about maybe use a 2.5D, something like 4 diferent planes in the space, and create a hidden object / where is waldo thing....
Still need some polish in the motion detection (even if It just follow the movement, it just turn to be crappy when yo are TOO CLOSE to the camera or too many people are in sight.
Great, loved it. Keep it comming