/ip firewall nat
add chain=dstnat action=dst-nat in-interface=ether-WAN protocol=tcp dst-address=192.168.0.1 to-addresses=192.168.1.15 dst-port=8080 to-ports=8080
With the above rule, it is stating that if any traffic comes in from the interface ether-WAN destined to the host 192.168.0.1 on port 8080, destination NAT to the host 192.168.1.15 on port 8080, with the OP setup, that rule will probably never even happen since the traffic would have to be a host device in the modem router LAN trying to go to 192.168.0.1:8080.
If the OP changed the rule to in-interface=(whatever the lan interface/bridge is) then someone in the MikroTik LAN could get to the camera by typing in the MikroTik’s ip 192.168.0.1:8080 assuming there is no http service running on the MikroTik already and there are no firewall options blocking the connection.
I total agree with the suggestion to change the modem router to a bridge if possible, I just made configuration suggestions with what was already in place. Honestly, I have a huge hatred for modem router devices. Half of the time, you barely have access to controls in the router since the user interface is barely manageable. Also troubleshooting is impossible because those mass produced pieces of junk do not usually have any logging capabilities lol. I would highly recommend purchasing your own modem and contacting your ISP to get your unit added to provisioning and just setup all LAN routing on the MikroTik and call it a day lol.