I would imagine that its tough to get a clean and crisp video result most likely using a very small lens assembly on a mounting with tons of turbulence coming off the planing surface of the board and water.
Still though, I'm curious about two things. I often see formula boards very tweaked (port and starboard) in their planing mode, and I wonder whether that might have influenced the visual image of the fin in any way. Secondly, I wonder about the camera mount design and its ability to maintain parallelism with the water surface at all times. Was it gimbaled in the mount in some way to sustain a true horizon? Or, maybe, was it just rigidly mounted perpendicular to the board?