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I think they did it over and over and then dropped the unused frames. It's essentially creating stop motion.
It looks like under cranking, but they actually acted/played the song slow when they recorded the video. Then in post they sped up the footage to sync with the song. Clever but its been done before, not necessarily spanning a couple days like these guys did, but playing the song slow and speeding up the footage to match.
The reason I say video over still camera (stop motion ) is that is how they got:
1. Motion blur on the people circling them. If it was a still camera then they would have to slow the shutter and close the iris, and to do that on a sunny day would require a lot of nd filters. And doing it that way the lighting would not quite match and from frame to frame causing a strobing effect, or much more post time correcting it.
2. that is how they can go from fast to slow to fast motion in 1 shot (like bullet time).
http://www.revisionfx.com/products/twixtor/
None the less it was done really well, thanks for sharing it. Clever things like this are very inspiring.