I drew out some plans to make this seem like a haunter could use it in an attraction, but the only way I can see it working is if the people watched...
I have spent some time this weekend thinking about this very same video and how it might actually be done. I say actually because this video is fake....
Managed one of the first haunted attractions in NJ...the "Brigantine Castle" in early '80's. Designed & built numerous props, rides & animatronics for various tri-state attractions. Designed & built the largest indoor haunted attraction in the state, the FEAR FACTORY, scheduled to open summer - '13 just outside Atlantic City, NJ.