Point a camera at the TV and make sure it’s in decent, viewable quality. But always check with the rules/mods of a game to make sure they don’t have other rules when recording like that (splits need to be added in post, audio needs to be clearly heard, etc)

if by "screen" you mean pc/laptop you dont need a capture card you just need to get a recording software but if you meant console gameplay do what Timmiluvs said