Sorry, I watched it at university. I do not know where one would purchase a copy these days. You might try sending a letter to KFC Investor Relations (seriously -- this department bends over backwards to say Yes in most companies).
It seems to be a WGBH (Boston area PBS station) documentary from the 80s. All the libraries around here have it (we have two copies), but only on VHS, betamax, or film. It's likely out of print and you're probably best off downloading it online.
If you're at a university, you could probably order it through interlibrary loan. There are actually a lot of libraries with this item and it'll likely be loaned (we do international loans all the time).