imageoverlay: Fix synchronization with facedetector
imageoverlay: Fix synchronization with facedetector

Change-Id: Icd52792c23bd4e328a25fbb4230862a4b19cd402

shelsonjava/kms-filters,TribeMedia/kms-filters,TribeMedia/kms-filters,shelsonjava/kms-filters,Kurento/kms-filters,Kurento/kms-filters,Kurento/kms-filters,shelsonjava/kms-filters,TribeMedia/kms-filters