The rate at which a video poker game pays out is dependent on the machine and the variant. Overall, it is believed that Jacks or Better, Deuces Wild and Joker Poker have got the best chances of paying you out.
These games often post percentages that near or exceed 100%. That being said, these payout percentages are not guaranteed. To be paid out at such a rate, firstly, you need to be very lucky.
Secondly, you need to be playing the game perfectly with regards to basic strategy, which is very hard to do in itself. In general, you should always approach every single gaming session with the idea that you are going to lose, but you get lucky and win.