first time use - run rtsp server

Hello ,
I'm very very new at nginx
and from what I read this might be the best sulotion for me

I have a NVR that show 4 cameras
I want to be able to connect to it and see only 1 camera each time
I did what it said here
https://www.npmjs.com/package/node-media-server
downlaod and run the app.js no problem .
but how do I connect to the camera
this is the url I use to see the camera :
rtsp://ROOT:ROOT12345@10.0.0.108:554/cam/realmonitor?channel=4&subtype=1

do I need to write a player for it? can someone show me how (very simple one - just so see what I need to do ?)

Thanks ,