def track_objs(frame,frame_id,objects):
    """Perfrom tracking on every object in the frame

    Parameters
    ----------
    frame : numpy array
        The input image to track the objects within
    frame_id : int
        The order of the frame in the video
    objects : list
        list of the current traffic object under tracking
        to check where they moved in the frame.

    Returns
    -------
    list
        a list of the traffic object classes with updated
        postions according to the tracking result.

    """
    # return new object
    for obj in objects:
        obj.track(frame,frame_id)

    return objects