GameTrailers (GT)'s web site has a collection of videos on various video and computer games. There are histories, facts, etc.
Gaming History Source's YouTube video channel has a ton of "Let's Compare" on old video games on various (system/port/platform)s. It already has video playlists for each year
Vintage Computing and Gaming shared Jason Scott's blog titled 5/"Five Unemulated Computer Experiences" -- "While I and many others work to turn the experience of emulation into one as smooth and ubiquitous as possible, inevitably the corners and back alleys of discussions about this process present people claiming that there are unemulated aspects and therefore the entire project is domed.
Idoiocracy's Reddit re(ply/sponse) mentioned his The Making of Games' alphabetical index of all submissions with many links including videos.
MarphitimusBlackimus/Marphy Black/Revenant100's YouTube channel has a playlist, with currently 24 videos and 2.5 hours, showing "Half-Life Fact Files -- Do you want to learn more about Half-Life? To see the obscure? To witness the oddities? Then, you've come to the right playlist!
This GamerSpawn small YouTube playlist "takes you on a trip through the history of some of the world's best game series."