Found this 1973 VFL training doco on YouTube, introducing people to the rules & skills of the game. It mainly focuses on the 1972 GF between Carlton & Richmond (highest scoring GF ever - 50 goals), but between 15:45 - 16:45 you'll see colour footage of South players Russell Cook (17) & Peter Bedford (11) demonstrating marking and baulking respectively.

Introducing Australian Football. A 1973 Documentary. - YouTube