This kotaku review of Eyepet shows how camera based motion control can be problematic outside of a controlled environment. Lighting and backgrounds are very different from home to home. Sunlight can be very problematic as it is extremely bright. It's crazy when a game asks you to remove the furniture. That is stupidity.
http://kotaku.com/5402930/eyepet-review-his-masters-voice
Failure To Launch – The technology underpinning this game simply isn't ready to go from "tech demo" to "retail game kids will play". You know something's wrong when the tutorial tells you to empty your living room of furniture, and definitely know something is wrong when half of the basic tutorials end in acute muscular pain as the EyePet randomly fails to respond to the most simple of commands. In short, in the real world (and I tested it in all kinds of lighting conditions), the EyePet ranges from mostly obedient to unresponsive to downright oblivious of your presence.
Anyone can guess. It takes no effort to throw out lots of predictions and have some of them be correct. You are not and wiser or better for having your guesses be right. Even a blind man can hit the bullseye.
