Depth perception over water, even rough water, is challenging to determine, even with experience. Depth perception when jinking around and thrill seeking may present a greater challenge. The pilot in the video was up and down and all over the place, rolling reversals this way and that, displaying poor airmanship and again judgment.
That is exactly what I saw in the video.
It made me fearful for whoever fly's with that pilot.
My opinion is based on thousands of hours of low level flying for over fifty years as a pilot trained and paid to do such flying, both fixed wing and helicopters.