First, I believe you would need to save the video in "DVD format" on your hard drive. Then I imagine you will need some kind of software to convert from "DVD to Digital" format and then save that on your hard drive. Then you would be able to upload the digital file to YouTube.
About ten or fifteen years ago I had a software that would do that. The software also allowed to edit (EG - crop) certain parts of the video. I used it to cut out certain scenes of old cult hot rod movies and uploaded to Youtube. Don't know if there are copyright issues with the old games (ESPN, CBS, etc.) because there was with some of those old movie clips I posted as they got taken down.
Google "DVD to Digital" converter I guess. Maybe some of these fancy new computers have something already loaded?????