Hi,
The AR camera sees everything it's camera settings allow it to see ( its culling mask property), so check that to be sure what can be shown.
how do you want to move objects that are being attached to tracking object? if you want to move them with the user Inputs, it should be straight forward, if you want to use them with some advanced touch to drag them around and such, then it's going to be more involving as you need to move them in reference to their tracking object, not the world. once dirty way is to unparent the object, move it around and when the move is done, parent it back to the tracker.
One other solution is to have an fsm that on lateupdate simply adjust the position of childs, so they are not parented, but simply enforced to look like it. then you can decide when they should follow or not, but a regular parenting switch should also do the job fine.
Bye,
Jean