AR target detection + obtain 3D camera position + gyroscope control

Hello,

I'm designing an app using Unity and the Vuforia package to show big real sized objets (like cars). The point is that if I want to see the object in real size through the camera I get to far from the target, and it usally loses the reference. I have thought in getting the virtual camera position to lock the target tracking and positionate the camera where the real device is relative to the object. Then I would like to use the gyroscope of the device to look around the objet (without moving the position of the device of course). By the way I don't found this kind of information in the docs for Unity.

I have already tried using bigger targets to get far from the object (like A2, A3 paper sizes) but I still don't get the desired result.

Any thoughts about this? Do I have missed any topic talking about this?

Thank you so much.

David