A few years ago, when I put together the previous incarnation this of page, I managed to find 4 videos featuring Rick Griffin on YouTube. Within weeks one had disappeared and another had been made private. So began a struggle to keep the page up-to-date and error free, which I eventually tired of.
A search on 19th April 2015 found 1,780 results. OK, they're not all for our Rick Griffin, but I'll be buggered if I'm sifting through that lot and listing the relevant ones here.
So, follow this link to go directly to the YouTube Rick Griffin results page and use your own judgement. I'm sure there are RG video's on Vimeo too, but you'll need to log in to Vimeo to find out.