Accessing a public PC

Source

Portforewarding
Enable DMZ
DMZ Host IP Address:192.168.1.NNN

Your ISP might block port 80 hosting. Is it possible to move the camera to port 8080 and have your friend access it via http://yourip:8080
You'll have to change your forwarding rules or just leave the cam in the DMZ until you can access it from the outside.