Is it possible to create own JAV using AI technology?

MUZ!

Yes, but it would be clunky, choppy, degraded in most scenes, and an editing nightmare. 5-7 second clips merged together. You might save some sanity and just create trailer-style (and length) movies.
 
If you don't have a powerful enough GPU, you'll have to research all the AI generation platforms out there, preferably the ones that allow or focus on adult content. That's for both image and video generations.
 
I've had some time here and there to start getting this together. I now think I have the source images I need, next is to generate some video clips and see what comes of it all. I even found a nice (and free) Japanese pop style soundtrack to go with it. No dialogue, though. I'm not quite there yet and not sure I'd like to even put my feet into that yet.