There is an organization called “NFL Films”. They are the repository for all NFL footage I think.
Admittedly I don’t watch tv. My last television was a black and white.
However, I was traveling and the tv was showing a documentary about the first Super Bowl. It was one of the best things I have ever seen, ever, on television.
There was wonderful video from 45 years ago. I’m sure you all know the story but it was new to me. One of the players was out partying the night before thinking that he would never play. It turned out he was the one made the winning touchdown.