Update app.py

app.py

@@ -109,6 +109,9 @@ def video_frame_callback(frame: av.VideoFrame) -> av.VideoFrame:
         bbox = hand["bbox"]
         cv2.rectangle(img, (bbox[0], bbox[1]), (bbox[0]+bbox[2], bbox[1]+bbox[3]), (255, 0, 0), 2)
 
+        cv2.putText(img, 'OpenCV', (50,50), font, 
+                   fontScale, color, thickness, cv2.LINE_AA)
+
         result_queue.put(hands)