I saw this video originally on spectrum.ieee
From the article there, “While filming probably required many, many takes as well as a controlled environment with a motion-tracking system to precisely fly the quadrotors, none of what you’re seeing here is CGI: it’s all real robots, doing real things, in real time, with a real human in the middle of it. Some of what you’re hearing here has certainly be modified, though: 10 quadrotors in close proximity sounds like a swarm of giant robot bees. That are angry. With you.”