It’s not a crime. You can use force to reclaim stolen property. Legally, it gets ‘interesting’ when you involve a weapon in your use of force, because some areas allow the threat of deadly force far before it can actually be used and you’re probably going to expose yourself to legal avenues if the police don’t like you when they show up. But simply kicking someone’s ass after they stole from you? Perfectly permissible.

If you want to talk about the morality of it, that’s a different conversation.