This guide should help you to identify the correct url needed by IpCam demo to work properly.
First of all, connect to your ip camera home page using a browser like Chrome, it should looks like this
then right-click with the mouse on the camera and choose Inspect (it can vary depending on your browser)
Inspect
now you should be able to see the complete url of your camera, update your settings and you are good to go!
You might experience ip conflicts between your internet network and VPN network:
netstat -rn sudo route -n add -host IPCAM_ADDRESS GATEWAY_ADDRESS -ifp ppp0