Some guy got a bunch of random YouTube clips of people playing instruments, editing them together into one of those omfg-I-can't-believe-this-is-real video. At least, I can't believe it's real.
Kituman is the person who did this excellent work. I don't know how many days it took to be cut, looped, edited. I don't even know days (or months) did it took to search and find the pieces that compose this funky tune. It doesn't matter: Whoever did it, he or she - Kutiman is a genius