Yes, I do that and am not using dyndns

But you need a static public IP - many ISPs use dynamic public IPs (WAN) which means the IP to your computer may change. If you have a static public IP, you can configure your router to point at the camera's IP via port forwarding.
I recommend you use another port that 80 for the camera, for example 8282 and then set port forwarding to your camera's IP (168.192.1.123 for example). Then you should be able to access the camera remotely as 123.456.789.123:8282 if 123.456.789.123 is your public IP (WAN IP).