This guy! I watch a lot of ski videos. This has to be the coolest video technique I've ever seen—right up there with Afterglow. The best I can explain it: Nicolas Vuignier tied strings around his iPhone 6, and swung the contraption around his body, above his head. The video takes advantage of the high-frame-rate, slow-motion capabilities of the phone. He may have used a wide-angle lens attachment; we don't know. At any rate: wow!