As in "some one who plays video games". Could I just use ゲーマー?
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As rintaun says, ゲーマー is the most general term for "some one who plays video games".
In its narrower sense, when describing a person, it can mean a "hardcore gamer" as opposed to just ゲーム好き (げーむずき, casual gamer). For example, if someone wants to say she's just a casual gamer, she might say things like
If you need to differentiate between different gamer types, there are terms that roughly corresponds to the english ones.