there isn't much you need to do...

Install the Nvidia plugin and I think you need to restart the server. Get the UUID from the Plugin.

Now, this depends on the image maintainer that you use, I use the Linuxserver Plex image which makes this very easy.

Open the Plex container and enable the Advanced view, under "Extra parameters" you add --runtime=nvidia. then you add a new variable with the following values:

There is also

Press done and the container will be recreated and now you can use hardware transcoding in Plex.

https://forums.unraid.net/topic/98978-plugin-nvidia-driver/

By the way, Unraid stores 2 Templates, the default and user templates. If you make any changes, you will get your template under "user templates" in the template selection by adding a new container. This means that your containers are not gone and you can just re-add them in the last state they were created.

So don't just pick the first one in that list, the second one is the one you should be looking for.

just for completion sake, keep in mind the following:

Thanks for this. Was there something that happened recently that would have reverted this? I set this up a while ago and left it alone. To my surprise, I checked the dashboard and didn't see a gpu. I didn't have the Nvidia driver installed or gpu statistics. Was there an Unraid update that did away with plugins I may have used a few years ago to get transcoding set up? I'm confused.

That got it.. my Dumb self just hand NVIDIA_VISIBLE_DEVICE and NVIDIA_DRIVER_CAPABILITIES as the name and didn't have it in the key field.. Appreciate it.