Originally Posted by Chickens hit:
“Have to say though that the vid can't have been done with one shot.....some very clever camera trickery going on especially with the first appearance of the dancers and also the way they disappear at the end of the song......unless anyone else can explain how it was done??”
From the lady herself:
Quote:
“"That is absolutely one shot, no cheating or trickery," Feist says, sounding mighty pleased. "The people were in that room the whole time! It's just the genius of [choreographer] Noemi Lafrance and [director] Patrick Daughters that they managed to make people ask questions like that!" Any mirage was the result of hard work, of course. The dancers spent three days blocking their moves, and when Feist arrived, they filmed 17 takes in one day, "and only finished five of them," Feist says. "The [computer-controlled] camera was on an enormous robotic crane, twisting and turning in that enormous warehouse. And either the camera would go awry or we would go awry, too, so we'd have to stop.
"But at the end, we were all shaking our heads. I don't think I've had so much fun since elementary school."”
From an interview for The Washington Post
here 
.