Add streamlit-webrtc sample

app.py

@@ -1,4 +1,24 @@
 import streamlit as st
+from streamlit_webrtc import webrtc_streamer
+import av
 
-x = st.slider('Select a value')
-st.write(x, 'squared is', x * x)
+
+flip = st.checkbox("Flip")
+
+
+def video_frame_callback(frame):
+    img = frame.to_ndarray(format="bgr24")
+
+    flipped = img[::-1,:,:] if flip else img
+
+    return av.VideoFrame.from_ndarray(flipped, format="bgr24")
+
+
+webrtc_streamer(
+    key="sample",
+    video_frame_callback=video_frame_callback,
+    media_stream_constraints={"video": True, "audio": False},
+    rtc_configuration={  # Add this config
+        "iceServers": [{"urls": ["stun:stun.l.google.com:19302"]}]
+    }
+)

requirements.txt

@@ -0,0 +1 @@
+streamlit-webrtc