This is the state of the art in Chroma-key / Bluescreen. A computer generate set is place not just behind but around the actors.
When you pan, zoom and dolly the cameras the set moves in a realistic way relative to the actors.
Pay particular attention to the glass table. That's what's amazing is it's transparent and yet shows the virtual set behind it.
http://www.brainstorm.es/
There are using mechanical encoders to track camera motion.
There are now mechanisms to do this entirely in software but it's usually a post production and not live.
You can probably do something like this in Adobe after effects using Motion tracking and chroma-key but it wouldn't quite be the same.
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