Personally, I don’t have many videos. I have only a few for my personal favorite artists. So I added these to my existing music library, using the above linked “official” way.
However, those videos cannot be used really for Party Mode.
There is unfortunately no way to e.g. filter out only music videos of a certain genre or artist and play them shuffled.
All you can do is add each video manually to a playlist.
If you are after a pure Music Video library, and you happen to have .nfo files and posters already, then install the .nfo importer agent and create a library which uses this as its primary agent.
If you don’t have .nfo files, I assume your best bet is an ‘Other Videos’ library.
Other users have created more elaborate workarounds, using Personal Media Shows. Where the Artist is a tv show and a music video is an episode of this show.
