Hi,

We have this documentation on AR tracked cameras with Unreal:
https://aximmetry.com/learn/tutorials/for-aximmetry-de-users/using-tracked-cameras-and-augmented-reality-with-an-unreal-scene/#augmented-reality
Please feel free to make any suggestions on where should be the documentation extended.

Also, while AR tracked camera does not support mixed cam. You probably could make something that fits your needs.
If you can detail a bit what you want to make, we might be able to help you here.

Warmest regards,