Cheese is pretty basic. It has photo mode, burst mode and video mode, plus a timer and 27 special effects modes that you can play with, but I’ve only found 1 of them to be useful, because there is no adjustment of the special effects. When I use Cheese with the web cam on my laptop, there is basic auto-focus and color adjustment, but I assume these are all automatic settings in the webcam hardware. I don’t see anything to set the focus or do color adjustment inside the API for Cheese nor in the API of its base library, gstreamer (here’s a tutorial).
It looks like it will take Purism a lot of work to add all the features to Cheese which are currently found in Android camera apps such as gcam and Snap. The i.MX 8M Quad processor on the Librem 5 doesn’t have an image signal processor or digital signal processor, so it won’t be able to do any specialized image processing very fast and then there is all the proprietary code to process images. In other words, I would only plan on basic photo and video functionality at first.