Most reverse proxies can only do http traffic. Traefik can do TCP and UDP, the camera is probably UDP

Yes, hairpin can make it work but some routers don’t seem to do it well.

The other issue is that on wireguard by DNS is set to pi hole and without doing this my internal stuff wasn’t working without doing this

Others have already answered but this might help understand.

On cloudflare DNS, I set my domain to point to external IP address my ISP gives me for my router. Ie example.com points to 107.474.274.12

Within my network, my internal DNS (pi hole) is set to point to the internal IP address of my server. Ie example.com points to 192.168.1.23

Note that in the first example, the router has port forwarding so that all https traffic (port 443) is forwarded to the internal IP of my server, 192.168.1.23. I’m both example, the traffic ends up in the same place but the route it takes depends on if the traffic starts inside my network (example 2) or outside of the internet (example 1).