"Rotate" background depending on person's position

[de-code]

To perhaps achieve a more "3D effect", the background could be "rotated" based on the persons position.
i.e. if the background was on a surface further behind the person, a camera could move and change direction with the person. Effectively looking at the background from a different angle.
(This is somewhat similar to #56)

Tracking could be based on the face, or posture for example.