There was a Hollywood movie called "Grand Ol' Oprey" (or something close) that had footage of him. I don't know if that ever became a video.Roger, there is such a video which traces the development of Bluegrass. I am not sure Uncle Dave is on it.
There is a video called "The Greats of Grand Ole Opry--Vol 3" which has Uncle Dave, and the McGee Brothers as well as some newer people. It is in the Country Sales catalogue for $25.
Murray