I just upgraded my router which is ZyXEL NBG6617 to latest version 21.02. All settings done and everything works fine except mjpg-streamer! In the previous version of OpenWrt 19.07.8, mjpg-streamer was working just fine...
I installed kmod-video-uvc | mjpg-streamer | luci-app-mjpg-streamer and trying to connect via web localhost:8080 but there's nothing!
Your information isn't helping. A lot more is needed. Here's some suggestions. If you installed OpenWRT, you should have known at least some of them already. Most of them apply to any Linux system, and even Windows services aren't that different.
Enable a service means auto-start on boot. It doesn't start it immediately, AFAIK. If you want it to start right now, without reboot, press start.
Does that service actually start when you try to start it? Does it keep running or crashes immediately?
If it starts, what port does it listen on?
Does the service start in console? (I mean starting it from /etc/init.d/) What does it say?
Does the mjpg_stream start manually from the console? Any errors?
There's the system log. We need it. Also post the lines that appear when you try to start the service, if any.
Is the camera detected by the kernel?
Is the camera available in /dev ?
Is the camera device accessible by the service?
PS: Please ignore this. I missed the "localhost" problem.