I also had some trouble playing it, I keep my ubuntu one release behind the "current" release for stability reasons so it is outdated but only slightly so.
Webm wouldn't work with any of my installed programs, and even the ogv file caused some trouble which is...unusual. It's been a few years since i got a video i couldn't play out of the box on my linux system.
I ended up playing the video in...firefox
Disclaimer: i know very little of media so it is likely classic PEBCAK. Ironically my ignorance almost prevented me from watching the very thing that would at least try to shed some light on the subject.
That said, the video is immensely interesting; I studied electronics (quite a while ago now) so a lot of it was familiar if deeply buried and for me it was about the right tempo, but I would imagine people with no introduction to the given material would have a hard time keeping up.
Anyway, cudos to the creator, it is a rare art to make something that "complex" accessible in 30 minutes.