Blur / healing brush effect on specific area of a 2D texture

Hello,

I'm working on a facial recognition app which I can detect and switch facial features with overlaying mesh and textures.

I have a face texture captured from a camera, I know the position of the area that I want to apply the effect, how can I blur or "heal" specfic areas in the texture?

I would like to achieve something like the healing brush in photoshop, so I can overlay my new textures more seamlessly. For example removing the eye brows of a person.