After creating an ortho and DSM, Photoscan offers the option of generating a very nice report with lots of details on the project. Among other things, there is a nice image showing the camera locations and number of overlapping images in each part of the study area.
Is there any way to output this as a data layer? It would be nice to be able to use this to clip your ortho and/or DSM to only include parts of your study area with greater than a certain number of images.