I'll list a few titles, but I don't know if some are currently available:
"Tokyo Olympiad" (deinitely available)-- This covers many sports in the 1964 OG. There's great footage of Bob Hayes winning the 100m and anchoring the 4X100, a good look at the 10K (won by Billy Mills), and the marathon, and LJ. You'll catch only a glimpse of Peter Snell, though-- and I've never understood that, because his dominance of the other runners in the 800m and 1500m would have made an interesting story for the average person who doesn't follow T&F. Also no coverage of the 5K.
"The Supermilers"---Covers all the world record holders from Bannister through Coe and Ovett, with great race footage and interviews that were current at the time of production (circa 1984).
"The Olympiad; Greatest Moments", distributed by Dreamworks-- Great coverage of Olympic races from the early days, up to some from 1992, and includes footage of Nurmi, Zatopek, Kuts, Juantorena, and Herb Elliot, to name a few.