Thank you for contacting .
For the router you need to change it in the System>Administration>Access control , change http port to 8080 and there is no need to make any port forwarding rule for this.
For the camera , you can make a port forwarding rule .
Internal port for the camera : That you can see in the camera settings , for e.g port is 80 or 90 keep that as internal port on port forwarding in Rut device. Then set external port as 80 . Then you will be able to access the camera through that port.
Further its better to provide a complete topology of your scenario with IP addresses and ports mentioned to understand everything more clearly.