I would not say either the originally proposed sentence or the sentence suggested by JamesM - both sound awkward/ungrammatical to me. I would suggest:
- Do you plan on coming to Hungary?
- Do you plan to come to Hungary?
- Are you planning on coming to Hungary?
- Are you planning to come to Hungary?
- (Do you have) any plans for coming to Hungary?
- (Do you have) any plans to come to Hungary?
Any of the options I suggested would be fine. Good luck, I hope they come!