There are a number of videos of Mas Oyama available on the net. It seems reasonable that students of his karate should see him in action, at least on video. Here is a collection of videos of Mas Oyama. I think though, that on reflection, Kyokushin has come a long way since he started it going.
1992 Interview in the US, with Cameron Quinn translating - Part 1
1992 Interview in the US, with Cameron Quinn translating - Part 2
Giving a TKD Lesson
Sparring and Fighting the Bulls
Mitsumine Winter Camp 1
Mitsumine Winter Camp 2
Mitsumine Winter Camp 3
Matsui, the current leader of the IKO(1)faction in Japan, twice Japanese Open Champion, and once World Open Champion, and one of the few who did the 100 man-kumite, is doing some pretty impressive kick combinations in this one. Hmmm..... will have to try that in class some day.
Some black and white clips
Most of these are duplicated elsewhere on the net, but I like this combination best.