Video Poker is a game of skill, in that choices a player makes effects the expected return from the game. In order to play video poker optimally, you have to learn the correct strategy for the version of video poker you are playing. The following link, to vegasmavens.com, has an essay on strategy for 9/6 Jacks or Better, a common video poker game.
Video Poker Strategy Essay on VegasMavens.com