app.py

import streamlit as st
    
#UIApp starts here
st.set_page_config(page_title="Python - Face Censoring", page_icon=":robot:")
st.header("Python - Face Censoring")

uploaded_file = st.file_uploader("Choose a video (only with 'mp4' extension): ", accept_multiple_files=False, type=['mp4'])
if uploaded_file is not None:
    #call python function
    
video_file = open('myvideo.mp4', 'rb')
video_bytes = video_file.read()

st.video(video_bytes)

with open("censored_myvideo.mp4", "rb") as file:
    btn = st.download_button(
            label="Download video",
            data=file,
            file_name="myvideo.mp4",
            mime="video/mp4"
          )