PBU has the option to apply backgrounds to guest photos without the need of a physical backdrop using AI Background Removal. This works in a similar fashion to regular green screen functionality, but without needing to adjust Chroma Key settings. 

In the Green Screen tab, you can choose your BG Removal Method from the dropdown menu:

For AI BG Removal, select this option in the dropdown menu, then apply either auto-select or user-apply, and choose your background(s) as usual:

AI BG Removal can also be applied to Photo Layouts and automatically applied to Photo Holders as usual. Simply pick your Green Screen filter in the Photo Holder Edit option:

Here you can see it in action: