Regardless of where it came from it's hard to look away when you see someone doing it. My only concern with this treadmill dancing is the risk of getting swept away by the treadmill itself if you are not careful. I'm pretty sure the safety instructions on the machine say avoid hopping on and off of the track while it is moving.
Still, I think if you find something you love that helps you get your body moving power to you! If this is the one you choose, maybe just start on a slower setting :)
Is this something you would try? What if it was a coordinated dance party like the video below?