I don’t think there is any documentation for it (at least I dind’t find it?), however this links might be a good start:
https://discourse.panda3d.org/t/panda-in-pyqt/3964/1]
[url]http://nishantdania.github.io/gsoc/update/2014/05/20/interfacing-panda3d-and-pyqt.html
They are related to PyQT, however they also use a pointer.
Is there any reason you want to use this specific framework? PyQT works quite nicely, and its easier to use with Panda3D I believe.