Update app.py

app.py

@@ -35,5 +35,5 @@ def doo(video):
 def display_video(output_video):
     return output_video
 
-iface = gr.Interface(fn=doo, inputs="video", outputs=display_video)
+iface = gr.Interface(fn=doo, inputs="video", outputs="video")
 iface.launch()