tryolabs/norfair: v0.4.1

Changelog Add demo tracking keypoints and bounding boxes using OpenPose and YOLOv5 (#99) @facundo-lezama Add documentation for draw_boxes and draw_tracked_boxes (#101) @aguscas Fix bug by removing reference to 'points_of_interest' (#95) @aguscas Add support for path drawing in video (#89) @aguscas Added labels to the drawing functions (#93) @facundo-lezama Added feature for tracking objects with different classes (#91) @facundo-lezam