IP camera viewer with Onvif video analytics in C#.NET

Question

Dear Developers,

We run a little offine/online hat shop and we've installed a Cisco IP camera in the show-window. I want to manage the video surveillance from code.

I've found an IP camera NuGet package for building an Onvif viewer in C#, but I need more: I have to count how many people watching the show-window. The CEO wants this for marketing purposes. He wants to know how attractive is our showcase.

Actually, I found a source about Onvif video analytics, but this whole topic is totally new for me and I feel I'm lost a bit.

Could you please recommend me a tutorial or a video guide or anything else that help me to implement this feature in C#?

Any help would be appreciated! ?Thank you very much in advance!

Regards,
JM