I have recently noticed that we have a "video-games" tag but no "tv-shows" or "movies" tag. Should we have a tag for tv related questions? (e.g. questions found in tv-shows or riddles where you guess the tv-show or movie)
You're mistaken: we do have a movies tag, with exactly 100 questions at the time of writing.
I'm not sure if a separate tv tag would be useful. Knowledge about movies and knowledge about TV shows usually come together, so I'd say both of these could be covered by a single tag, maybe the existing movies.
(I would disagree with the commenter who said all such tags should be merged into trivia. It's very useful for solvers to know what kind of trivia they'll be expected to know. For example, I directly skip any question tagged video-games, but I'll have a look at any question tagged literature. Please keep these tags separate! Avoiding spoilers isn't an argument, because it's the OP's choice how much information they want to reveal in the puzzle.)