add commented code

app.py

@@ -49,6 +49,7 @@ def process_video(video_path):
     fourcc = cv2.VideoWriter_fourcc(*'mp4v')  # MP4 codec
     out = cv2.VideoWriter(output_video_path, fourcc, fps, (frame_width, frame_height))
 
+
     # Process each frame of the video
     while cap.isOpened():
         ret, frame = cap.read()  # Read a frame