crowdetector: Add data structure to store information of each roi

This information includes occupancy and fluidity parameters

Change-Id: Iae6c68a654b673fa50f94a65923276a2d681f040
crowdetector: analyze occupancy and fluidity of each roi

Change-Id: I3f5f71dab6001f377a2b7b8481a63a03a6d8fc93