added interface

app.py

@@ -0,0 +1,18 @@
+import gradio as gr
+import os
+
+
+def video_identity(video):
+    return video
+
+
+demo = gr.Interface(video_identity, 
+                    gr.Text(), 
+                    "playable_video", 
+                    examples=[
+                        os.path.join(os.path.dirname(__file__), 
+                                     "video/video_sample.mp4")], 
+                    cache_examples=True)
+
+if __name__ == "__main__":
+    demo.launch()