It looks like it's being reflected off an inverted four-sided hollow (perspex?) pyramid, rather than projected into a prism, but still a neat idea; sort of like the inverse of the (formerly Microsoft) Polycom 360 degree conference camera.[1]

I'm curious what it looks like viewed from one of the edges - I can't picture it being seamless?

[1] http://www.polycom.com/products-services/products-for-micros...

He moves the camera to another side across the edge in the video- it's far from seamless, it's exactly as you would expect- two images in perspective.

It is a few years old, and it's not a hologram (not 3d).