Hello,

I have a raspberry PI running nginx. This is accessible from outside my network and works fine.
How can I configure it so that I can access a webcam, that is not accessible directly from outside? So the IP from the camera is not added to the portforwarding in my router.

Can someone advise on that?

in principle you can create a reverse proxy that routes requests to the webcam. Google it, there are lots of examples, BUT - and it can be a big “but”, not all web cams are easy to do this for....

You may need to experiment to get it working. .

Look up how to create a reverse proxy and then you need a location block something like this....(no guarantee!)

location /cam3/ {
proxy_set_header Host $http_host$request_uri;
proxy_pass http://cam.era.ip.addr:port/;
proxy_read_timeout 120s;
access_log on;
}