Back cameras upside down how to rotate the feed?

[HarlockTheSin]

Hi,
I am setting all up for the first time.
-4 pseye cameras
-2 in front (with 2 meters extention) and 2 in the back (+ 10 meters active extension)
-Each one connected to a different USB root.

Back cameras are mounted upside down as I glued them to the back speakers of my 7.1....

Front cameras can track at 50 fps not higher, 60 would freeze.
Back cameras only 40 fps, 50 would lag.

I think this is due to the fact that the back cameras are upside down. Controllers are warping towards the ceiling. And it looks like something is wrong in the calibration area.
See screenshot: https://i.paste.pics/ffb140d797ed6f6a050efa59f756e889.png
How do I rotate the camera image?

What leaves me puzzled is that, before glueing the bat cameras, I found more than one topic here confirming that the tracking works with no issue with Cameras upsidedown.
#577

Can anybody help? at least with the second.

Thanks