already exist
some Japanese eroge already contain this feature, where the world view in the screen will change as you move your head. It uses the PC camera to track your movement.
Also there is another eroge where the figure on the screen will live on your desk. It uses the PC camera to take images of the environment and tries to interact with it on your desktop.
also, haven't the same thing been shown on anime and movies for a long time?
note, I doesn't matter if you like eroge or not, that fact that the feature of the PC changing the world view on the screen based on your head movement have been around for more then 2 years. The only problem is.... the Japanese seem *not* to have bother to patent their already *existing* system!