Where ``frameN_dict = {'topleft': (row, col), 'bottomright': (row, col)}``
is the dictionary defining the coordinates of the face bounding box in frame N.
"""
annots=f.f.bbx(
directory=self.original_directory
)# numpy array containing the face bounding box data for each video frame, returned data format described in the f.bbx() method of the low level interface