Please look at Learning about Dolby Vision and CoreELEC development - #650 by lafi
N2 is not licenced for Dolby Vision so it won’t work ootb with normal builds. @doppingkoala has a build where it can output Dolby vision from other socs. Give it a try.
The performance boost was dismissed in another thread as placebo. But you can search the forum.
Just a final note, this isn’t a commercial product. Some comments are uncalled for.