Your server is a Comet Lake gen 10 CPU with integrated GPU UHD 630. It is supported by Handbrake Intel QSV https://handbrake.fr/docs/en/latest/technical/video-qsv.html . All you have to do is add the device file to the docker definition. I use portainer and add:
devices:
- /dev/dri/renderD128:/dev/dri/renderD128
- /dev/dri/card0:/dev/dri/card0
- /dev/video0:/dev/video0
- /dev/video1:/dev/video1
- /dev/video2:/dev/video2
- /dev/video4:/dev/video4
but this depends the computer hardware. I woulmd check what is under /dev and starts with /dev/video<x> and /dev/dri/card<x>.
Though it seems unraid has its own way of adding device to containers. See this link:
Here they add a directory with --device="/dev/dri/".
/dev/video<X> are for decoding and encoding.
Note Tdarr looks great. Under the hood it runs Handbrake or directly FFmpeg.