I don't understand why you insist on videos.

I was able to create a full 3d model of my window plant almost free of obscured areas from a few dozens still photos taken all around it, back in 2018, using the Capturing Reality photogrammetry app on a mobile i7-3610QM CPU with 8Gb RAM, in about 40-60 minutes.

And that's pretty mundane general public software, do we know for sure which algorithms are used by Niantic?