Some fantastic shots. I saw this a few months back.
Last July, I spent two weeks travelling around 4 locations in the US to make a boarding video for American Airlines. We spent 3 days at Grand Tetons (the snow peeked mountains at the begining of the linked vimeo) recording timelapse and slo-mo . It's a stunning place.
Those time lapse shots look as if they are using a portable motorised rail. Quite probably a Dynamic Perception rig.