Implement DOF

[PhoenixLandPirate]

This automatically blurs the background, this is a great feature, this is something which works amazing with 2 cameras, but can also be achieved using a single camera, having both implementations will make it so those with 2 cameras can still expect to achieve their depth photos, and to those with 1 camera, can now have the ability to use DOF.

Here's a article about how DOF works with 1 camera
https://www.dpreview.com/news/4850302495/google-reveals-how-to-simulate-shallow-dof-from-a-single-mobile-camera

This is the full PDF of how it works!
https://arxiv.org/pdf/1806.04171.pdf