Does Plex have any support for Non-GPU video accelerators like from Advantec for example https://advdownload.advantech.com/productfile/PIS/VEGA-3314/file/VEGA-3314_DS(110220)20201104110820.pdf
If you can make it work using COTS libva drivers then it will work.
Commercial equipment is not supported.
Not for commercial use, and I realize this particular unit is priced well above a typical GPU, just a general question about accelerators in general, but good to know there is a path if brave enough… 
