Is it possible to track physical objects on a blockchain?
I forget who once said this, "If you think you need to use BlockChain technology, you almost certainly don't."

BlockChain technology is designed to show proof of ownership via a proof of work mechanism that ties an expensive-to-run algorithm to a cryptographically secure chain of transactions.

If your system seeks to track ownership of objects where ownership changes regularly, and you need to prove ownership, perhaps a BlockChain solution might be applicable.  However, if your objects don't regularly change ownership, and you're simply looking to track geographical position, I would recommend some other data storage system, such as a typical relational database.