The idea is to use simple inexpensive AR glasses with a smartphone, where the screen is reflected to the eyes through a mirror. The image of objects is perceived by the front camera, or by an external portable camera (mounted on glasses)where it is necessary to mirror the camera.

Hi,

We deprecated the Phone mode+Viewer I believe starting with 8.5.

In regards to you scenario, you could use the external camera feature to connect a USB camera to an Android phone, more info here: https://library.vuforia.com/tools/driver-framework.html

However I am not clear what you want to achieve with the camera mirroring function, could you please elaborate your use-case?

Thank you.

Vuforia Engine Support