Create app.py

app.py

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+import av
+import cv2
+import streamlit as st
+from streamlit_webrtc import webrtc_streamer
+st.title("Computer Vision Streamlit application")
+class VideoProcessor:
+    def recv(self, frame):
+        image = frame.to_ndarray(format="bgr24")
+        image = cv2.cvtColor(cv2.Canny(image, 100, 200), cv2.COLOR_GRAY2BGR)
+        return av.VideoFrame.from_ndarray(image, format="bgr24")
+webrtc_streamer(key="demo", video_processor_factory=VideoProcessor)