Hi Guys,
It took me a while to figure this out for myself and there are tons of threads stating that it's not possible, so I wanted to post this very, very easy solution to display Movie Extras within Kodi, while also using Emby for Kodi as your backend.
1. Setup your Emby library in Kodi using Direct Play (this doesn't currently work with playback via Add-On)
2. Install the following Official Kodi Add On: https://kodi.wiki/view/Add-on:Extras
3. Add a subfolder to your movie directory called Extras... IE /path/to/movies/moviename/extras
4. Locate the movie within Kodi and then, using the Context Menu, click on Extras which will bring up a list of all your movie Extras
- If you prefer to change the name of the directory that the addon looks for, IE from Extras to "Bonus Features" you can do that from within the Add On
The Extras then display within the Movie Info screen of Kodi. I don't believe you can use NFO files to customize the content, but the video files themselves all show