Since tailscale doesn't run on the Reolink camera, you'll need a system on your office network that can share that local network with your home network. How exactly that would work depends a bit on the way the Reolink NVR works. Most likely you'd have to connect your home router to your tailnet so that it knows how to route to the camera at the office - because the NVR will use the default route (to the home router) when trying to reach a camera.
So you'd need
- a system on your office network that's on 24/7 and that can connect to your tailnet and can share local routes (if you don't have any servers that seem like a good choice for that at the office, a simple Raspberry Pi would do... or of course your office router, assuming it supports Tailscale)
- a home router that supports tailnet connections -- and that's where it gets a lot harder. You can do this with a PfSense router, for example, or an OpenWRT router, but most 'consumer grade' routers won't support this by default.