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Pleasuring yourself on webcam? You should be charging him for that! Apparently you can make loads of money if you get the particulars right.
Seriously? I'm calling bullshit on this one. I take it you've changed all your passwords (you'll have to change them again anyway).
Google "Reddit malware removal" for the steps to take to remove any malware, Trojans, keyloggers etc
If they've sent you footage of yourself then that's a different thing but in the meantime they got un/lucky with capturing your rawk password and nothing else and they're trying hard to make you think they can do anything they want from their powerful position. Bollocks.
If you're really worried, cleanse your computer and change all related passwords then close down all your social media so that anything posted doesn't hit your circle. Nobody else gives a fuck. Maybe you don't.
I didn't ask. Are you concerned? You didn't say...
Regardless, good luck, mate!