First off thanks for posting your reply I appreciate you taking the time. I completely understand these are NOT production ready application and, as you described just demos etc. That is fine with me as I have a starting point and now, I can expand it etc. That's what I wanted!
I am sure I can have the app read a mp4 file and feed the frames to the pipeline. That is pretty easy. When you speak of a database, I assume you mean one of the .npz files? Just as you do when creating a vector filled file of a particular person? Obviously, the number of frames of any one person will be pretty small as they are not necessarily doing a pose to build a larger file. Most likely I would get a few seconds of someone in a video and that would happen maybe once or twice a day. So, it will take time to build up enough data for real accuracy. I think that is to be expected.