typo in sample input video name

app.py

@@ -151,7 +151,7 @@ with gr.Blocks(title="Sign Language Translation") as demo:
 
     # Add sample input video
     gr.Examples(
-        examples=[["data/letter_seq.mp4"]],
+        examples=[["data/letters_seq.mp4"]],
         inputs=[video_input],
         outputs=[video_output, text_output],
         fn=process_video,