The room in the video actually rotates as a unit, and all of the furniture is nailed to the walls and ceiling. Also, the camera remains attached to the rotating room, making it appear as though the dancers are defying gravity.
Famed Broadway dancer Fred Astaire popularized this method in a dancing routine from the 1951 movie “Royal Wedding.”
I think the technique was very effective in the centrifuge scene in 2001.
http://www.youtube.com/watch?v=oh9sn5gn2fk
Here the camera isn’t fixed, but pans to follow the astronaut jogging around the centrifuge.