I found this documentary called Brave New Worlds: the Science Fiction Phenomenon, from back in 1993, which was broadcast in the UK, I believe. It’s pretty interesting, especially the commentary from various authors such as Robert Silverberg, Arthur C. Clarke, J. G. Ballard, Brian Aldiss, Octavia Butler, Kim Stanley Robinson, William Gibson, as well as SF critic John Clute, some film people such as Paul Verhoeven, and others. Running time: about 54 minutes.
Note: even though in English, the videos are subtitled in a some other language, but it’s easy enough to ignore. Also, several minutes of sound are covered by static in part 2. I don’t know what that’s about, but these are the only copies I could find.