write info message below the video

app.py

@@ -231,3 +231,7 @@ if video_bytes is None:
     st.stop()
 
 st.video(video_bytes)
+
+if len(selected_metrics) > 0:
+    st.write("Note: For the selected metrics, the instantaneous values are indicated to the upper right of each subplot, "
+             "whereas the average value over the sequence is indicated in parenthesis next to it.")