As title says, I've found a dude who claims to have the footage, but he's not sure how to export it. Looking online they obviously don't officially support it, but what way would be best to get the footage out? Could youtube-dl somehow work, if login cookies could be passed?
Worst case would be to do a screen recording, but I'm not sure I can convince the dude if it's going to take that long.
not sure what youtube DVR is, but assuming its still a digital video in youtube format this may be helpful: https://blog.hubspot.com/marketing/how-to-download-and-save-youtube-videos