Hi would possible to add game video preview s or if I could get it added and if someone would compile for me or even make lakka more theme able
We don’t support video previews currently, no.
What we could do in the future is to launch a sall libretro instance running the game if you enter the game in the playlist. But it could be too heavy for some platforms. And some games have very long sponsor screens.
maybe try GIF format game thumbnails？