Pyds tracker_bbox_info not found

I have this error on access metadata fields in DeepStream-5.0 GA.
Why ?


bbox = obj_meta.tracker_bbox_info
AttributeError: ‘pyds.NvDsObjectMeta’ object has no attribute ‘tracker_bbox_info’

I have the same error. the manual https://docs.nvidia.com/metropolis/deepstream/python-api/NvDsMeta/NvDsObjectMeta.html indicates that is valid property