Brakhage
Starring Stan Brakhage, Jane Brakhage, Marilyn Brakhage, Neowyn Brakhage, Bearthm Brakhage, Jerry Aronson, P. Adams Sitney, Phil Solomon, James Tenney
It's a documentary and biography movie, and has a rating of 6.4 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Belgium.