This idea has been turned into reality by using a right combination of jets used in RC planes. that works pretty well. but if you are looking to make it some other way using some anti-gravity materials then that would be a big blast. i also thought about it after watching the “THE BACK TO FUTURE movie series”.check out this video https://www.youtube.com/watch?v=k7vlJEufGvE. the video you attached in here seems impossible because its not using jets rather its using some kind of anti-gravity material beneath it because when it doesn’t splashes the water like the jets do, as it goes over it.