This is part of what was added this week in the user manual (the update hasn’t been yet published).
The only mode that should really be of interest here is the blob detection. Instead of just measuring the amount of noise on the screen, it will look forward for big moving objects. You can right click on the camera and select View -> Motion View this will actually show you for each mode what it’s doing / detecting in a visual way. This helps understanding what it does and how to tune the settings based on your environment.
The person detection / face detection I suppose are self-explaining but they use quite a lot of resources for not providing great results, as the blob detection.