As far as I know the PIP function works the same in all the boxes.
The problem is that processors HW do not support HD>>HD PIP
but only SD >> SD hardware based PIP.
So HD PIP is I think software compromise
work as in your video.
Do you need some plugim?
What is the way to install it?
NO . but everything is in the image.
I can not currently test on VU solo
But I think it is similar in all VU boxes .