Hm. Doable. I think the hard part for that then might be getting the real time information about the position and orientation of the viewfinder in high enough resolution.

Keep in mind "the black box" can output the position in 3 space (x,y,z, measured in mm) of coherent sound sources, but to know where those are relative to the camera, so that once can draw a little arrow, can be hard.

I'd like to try hooking it up to a VR/AR headset, since I imagine those already handle the task of knowing precisely where my head is and where it's looking.