Theres an article on fxguide discussing Lightstage 6, capture technology for the special effects/post production industry that allows a figure to be captured and then completely relit and viewed from any angle within a scene. It includes a treadmill to allow the actors to perform locomotive actions such as running or walking.

The result is hugely impressive – producing hugely convincing scenes and provides those working in post-production with huge amounts of flexibility and the ability to make significant changes to shots after shooting or re-use assets from previous shots.
You can view a quicktime overview here. (Well worth watching)

Thanks to Nick for the link