Imagine you're a clothing company, you get a 60" monitor and hook it up in a mall. Then you take one of these PC's connect a HD camera to it, then proceed to perform some image processing on the picture in real time. As a person walks past the monitor show them walking, but replace their cloths with the companies cloths. That would catch my attention.
An interesting idea, but I can imagine that under realistic constraints such a solution would look rather tacky, unless the person was standing completely still.
Oh wow. This is funny. I know someone who spent 2-3 years developing the technology for his phd (it's pretty complex to get it right/good). Anyway, the fashion industry is a pretty conservative industry (weird huh?) so he has a hard time monetizing it even though it has a lot of potential.