All this info is not present at one common place, but I can summarize it below for Linux platform -
H265 encode/decode is available only through Media Server Studio professional edition.
H265 HW acceleration is available from 6th generation forward. On 5th generation and below you can choose to use sw or hybrid implementation for encode and sw only implementation for h265 decode.
H264 encode and decode is available on all the generation core processor i.e. 4th, 5th or 6th generation.
Vp8 decode hw accelerated is available from 5th generation and onward and Vp8 encode has hybrid implementation support on 5th generation. Vp9 decode hw acceleration will be available from 6th generation onwards.