Is there a way to trace all the registered owners of a car using the VIN?
If you're up to a lot of good old-fashioned detective work, starting with the previous owner and working your way back from there, yes. some state DMV's may be helpful, most will not. There's no place/site I'm aware of where you can plug in the VIN and get any previous owner information.
We (CRG) maintain a private database that has basic configuration history on several thousand 1st-gen Camaros, and your car may or may not be in the database; post your VIN and cowl tag data and Kurt can check for you.