nvidia hw video encoding not working

Hi, I ve tried 3 different nvidia cards and none of them seems to work in terms of hardware encoding. In the task manager, video encode always shows 0% and cpu goes easily to 100% after 4 connections.
Is it something I m doing wrong?
3 different machines, 3 different cards, Quadro K2200, 1050ti and 980
thank you

Can you check which codec you are using?

Hi, I ve checked the renderstreaming element and the renderstreamingcamera, all I ve found is the streaming size and the depth buffer, not codec information.
Is there somewhere else I can look to change the codec?
thank you

You can see the information of the codec in the webrtc-internal page.
https://webrtcglossary.com/webrtc-internals/

8118206--1051985--upload_2022-5-11_11-8-5.png