They are one of the Boraras species, he doesn't mention which one in the video he just says Boraras. The ones in the video don't look like chili rasboras (B. brigittae), the one most often seen in stores. Possibly B. merah?
I have a terrible time with merah and maculatus - I assume the ID had geographic location info. Sometimes colour patterns are variable from capture place to capture place, and all you can go on is where they're from.
I gave the ones I got to a friend with pet store chili rasbora (B mera) and she said the 2 fish were distinctly different. Then again, the film could be from a different batch - I bought a bunch not long after that film, but wholesalers turn over a lot of fish.