My vote is "real." A few of the comments (why isn't it turning with the bank, where is the wake) seem to be based on the video speed being real time. It's actually slowed down quite a lot.
As for the blades, we're seeing correct rotation of CCW of the front and CW of the rear
when seen from above, but the camera is in that very narrow space, where we're seeing the front rotor from above, and the rear rotor from below. That aside, when looking at a poorly lit silhouette, it's easy to fall into a wrong-way spinning illusion like the spinning dancer:
Also if it was fake, it would have taken a hell of a lot of coordination for all the people to be looking/dodging at the righ time.