"I would need some piece of software that can output a 3D model..."

Completely out of my depth (no pun intended) and showing it. So if the hand/camera etc. were set up, exporting the hand as a 3D model (.obj format) would allow you to extract the data? I think if you export it as a 'morph target,'  it will essentially export a point cloud, thoug I may be, probably am wrong on that. You probably wouldn't want 100K models lying arounf, so I'm assuming some kind of export->analyze->delete pipeline. I'd be interested to know what goes in the database. It would be an interesting design. Perhaps if it's not proprietary, you could explain more about the ultimate use of this beast. Apologies if I've entirely misunderstood what you're looking for :-)

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken