Update app.py

app.py

@@ -61,7 +61,7 @@ def video_frame_callback(frame: av.VideoFrame) -> av.VideoFrame:
     result = hands.process(cv2.cvtColor(img, cv2.COLOR_BGR2RGB))
 
     # Create a blank canvas for drawing the keyboard
-    keyboard_canvas = np.zeros_like(img)
+    # keyboard_canvas = np.zeros_like(img)
     buttonList = []
     # Define buttons in each row of the virtual keyboard
     for key in keys[0]: