The video basically ran some random JS script that probably screwed over your Roblox account. The games support team should be able to help you. Beyond that though you shouldnt be at risk, if the game has any substantial security features built in (like not saving your credit card information in plain text) you shouldnt see anything spread beyond the game.
However in the worst case that your credit card did leak, then just keep an eye on your back account, or if your really worried cancel your existing card and get a new one.
Long story short, dont enter random stuff into any application without getting it vetted, especially if it sounds too good to be true. Roblox is very well known as an easy target for hackers to steal unaware peoples information as a lot of kids play the game.