There's a nice page on the ChessBase website with YouTube footage of Akiva Rubinstein, Jose Capablanca, the Botvinnik-Flohr matches, the 1946 USSR-USA match, Botvinnik-Bronstein in 1951, Geller-Smyslov in 1955, the end of the famous 1962 game between Botvinnik and Fischer (and Botvinnik sure looked happy to save the draw), Petrosian-Botvinnik from 1963, some Tal footage and then it's Karpov's turn, as he's shown offering commentary with GM Ron Henley on game 3 of the 1972 Fischer-Spassky match. It's all worth a look!