I checked one of these videos out from our library. It is a series of about 5 tapes on enhanced memory skills. The one I saw was on numbers, and was recorded partly at the 1993 Mind Olympiad in England. The contest involved an announcer reading 100 numerical digits at about one per second, and the contestants had to memorize them on the fly.
The winner got all 100 right.
Of interest to magicians was a short bit of film of Chan Canasta revealing which six cards were missing from a deck.