The Computer History Museum has a youtube channel with a lot of material on it. While it's mostly old material (oral histories from people who were movers and shakers in computer science in the 40s and 50s), it has a lot of re-uploads of technical talks from more recent conferences too. (For instance, they hosted some transfers of VHS recordings of Alan Kay lectures on OO at some mid-90s conference at Sun.)
YouTube and archive.org
"Computer Chronicles"
"Computer Chronicles" are more user-oriented, kinda marketing videos. I'm interested e.g. in C++ tech talks (from 90s).
They display and do deep dives into the technologies they are demonstrating. I'd say it's a good match.