How to stop AR from moving objects?

In AR Foundation I’m wanting an object to stay in the same place relative to the camera/not be affected by AR tracking. I’d like for other objects to be able to remain affected by AR tracking too.

Is there any way to do this?

An example of roughly what I am talking about can be seen here:

There isn’t any AR-specific trick here-- I would recommend just making your object a child of the Main Camera? That way when the camera moves, the object will always move with it.