I second this recommendation for Moleman 2 documentary, but the video I found has a different link:

https://www.youtube.com/watch?v=iRkZcTg1JWU

Looks like this version is in English, while the earlier link is in Hungarian, otherwise they appear to be the same film.

If you'd like to know where the demoscene came from, look no further than The BBS Documentary[1]

The whole thing started w/ cracktros in the 80s and through the artscene it eventually evolved into its own scene that was entirely disconnected from its roots in piracy.

1. https://www.youtube.com/watch?v=Dddbe9OuJLU&list=PL7nj3G6Jpv...