Utilize media metadata Date and Face-Tags in import and references

I think what you are describing may already have a pull request (that is now out of date) and is discussed here: Suggested Update to PhotoTaggingGramplet to Support XMP Face Regions

I have created a Gist on Github code that updates the Photo Tagging Gramplet. This update displays existing regions in images and allows a user to associate a Gramps Person avoiding the need to redraw the region.

To try this code you need to replace the contents of PhotoTaggingGramplet.py with the contents of this Gist: Gramps - PhotoTaggingGramplet.py - Modified to display person regions embedded in photos · GitHub

I have only tested this on a Windows computer. Please backup your data before using this.