As for ownership and use, I'm pretty sure I recognize the voice as that of Jeremy Pickett-Heaps, a professor where I did my Ph.D. So...I doubt this poster has the copyright. Jeremy's youtube channel is here: ru-vid.com/show-UCH6cxhgl-S0Lk1nnaX8cMGA
I find it interesting that some animals, like comb jellies and many flatworms, still use cilia to move around. It's likely that before muscles evolved, the first multicellular animals used cilia for locomotion. In other words, the nervous system evolved to control the cilia, not muscles.