Most of the big casinos that offer poker rooms allow you deposit money with crypto currencies. The balance on the casino is usually in US Dollar, so the casino is going to convert the coins for you. Whenever you want to withdraw money again you can choose the same method as depositing. You are not gambling directly with cryptos, but at least you can withdraw your winnings with it. If you haven't played before at GGPoker or Poerstars I would recommend you both of them. They have promotions for new customers always that are really good, you can get either a deposit bonus or some free tournament and sit and go tickets. I managed to get some decent profit out of them.