I just spent the last hour looking all over the web and couldn't find a darned thing. Perhaps I'll try the deep web next...

Just because the session was in 1985 doesn't mean that such a video doesn't exist. I just watched a couple of videos of the actual American Expedionary Force in Siberia in 1918. So, I dunno. I guess the big question is whether or not someone actually filmed the session. If they did I suppose it's possible that a video exists. If they didn't, well... yeah. THEN there wouldn't be a video.