Woody Guthrie can be seen sitting on a door step in the film THE FIGHT FOR LIFE, about 5 seconds. He is strumming his guitar, however the sound was dubbed by another.
https://www.youtube.com/watch?v=aOKjRBDTNso at 58:18
Fight for Life, written and directed by Pare Lorentz who also made (for the US Government) two better known films THE RIVER, and THE PLOW THAT BROKE THE PLAINS.