The video is available from YouTube under the title "1939 German-Soviet troop parade in Brest Litovsk" In YouTube the video clip can be blown up to full-screen size. Runtime:02:14. Original commentary in German would require translation. There's also another video clip in YouTube called Nazis and Soviets in occupied Poland in 1939 with still photographs from the invasion. Runtime 02:42. It has a fairly good resolution which would allow for a series of screen-shots to be uploaded to Commons.  talk