Your camera should already be linked and when you ask the Hub Show [camera name] it should just work. If not try closing the Google Home app and trying again. Be sure that both are using the same Google Account as well.
It looks like we haven't heard back from the OP so I'm going to go ahead and lock the thread. Thanks for the help here JillG. If you have any further questions or concerns, feel free to create a new thread.
Have a great day,