Camera Masking option in AR camera

Hello Guys

I was wondering if I could simulate a camera mask in the AR camera. This should help me view all the objects within the mask and negate everything outside the mask.
Do we have a default option for this or it needs bit of digging into java script?

PFA for a brief understanding.

Thanks in Advance

There are no default option for this. And it seems that artoolkit has no API for masking. I think you can use MultiMarker and project each detected marker position to the camera view plane and filter them using the mask.