GameTrailers (GT)'s web site has a collection of videos on various video and computer games. There are histories, facts, etc.
MajamiHiroz's YouTube channel has a bunch of videos, with cussings, showing mostly (spoof/parodie)s of mostly video games and the (19)80s days -- "Welcome to the '80s.
Reddit has a group for recorded videos showing the stories to various video games.
Mr.TVCow's YouTube channel has a bunch of funny videos related video games, entertainment, visual/special effects, etc.
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!