No output about deepstream-yolo-pose HOT 4 CLOSED

def add_obj_meta(frame_meta, batch_meta, boxes, confs):
    pyds.nvds_acquire_meta_lock(batch_meta)
    for i, (box, conf) in enumerate(zip(boxes, confs)):
        new_object = pyds.nvds_acquire_obj_meta_from_pool(batch_meta)
        new_object.unique_component_id = 1
        new_object.class_id = 0
        new_object.confidence = conf
        new_object.obj_label = 'person'

def osd_sink_pad_buffer_probe(pad,info,u_data):
    batch_meta =  pyds.gst_buffer_get_nvds_batch_meta(hash(gst_buffer))
    l_frame = batch_meta.frame_meta_list
    frame_meta = pyds.NvDsFrameMeta.cast(l_frame.data)
    frame_number=frame_meta.frame_num
     ...
    display_meta=pyds.nvds_acquire_display_meta_from_pool(batch_meta)    
    py_nvosd_text_params = display_meta.text_params[0]

   # Setting display text to be shown on screen
   # Note that the pyds module allocates a buffer for the string, and the
   # memory will not be claimed by the garbage collector.
   # Reading the display_text field here will return the C address of the
   # allocated string. Use pyds.get_string() to get the string content.
   py_nvosd_text_params.display_text = f"Frame Number={frame_number}")

osdsinkpad = nvosd.get_static_pad("sink")
if not osdsinkpad:
        sys.stderr.write(" Unable to get sink pad of nvosd \n")    
osdsinkpad.add_probe(Gst.PadProbeType.BUFFER, osd_sink_pad_buffer_probe, 0)
   
 # start play back and listed to events    
pipeline.set_state(Gst.State.PLAYING)