How can I find info of Gst-nveglglessink in DEEPSTREAM PLUGIN GUIDE?

I’m working on Jetson AGX Xavier with DeepStream Python apps.

And with this API guide:

The apps work perfectly fine.
However, I can’t find any plugin information of the “sink group” plugins, such as nveglglessink or nvoverlaysink.

Or perhaps these information can be found elsewhere?
Appreciate for any help!

nveglglessink is not deepstream plugin. DeepStream SDK FAQ - Intelligent Video Analytics / DeepStream SDK - NVIDIA Developer Forums