AutorunRPi.txt

sudo nano /etc/xdg/lxsession/LXDE-pi/autostart
@chromium-browser --start-fullscreen --app=http://localhost:5000

sudo nano /etc/systemd/system/startWebApp.service
-------------------------------------------------------------------
[Unit]
Description=Start web UI
After=multi-user.target

[Service]
ExecStart=/usr/bin/python3 /home/pi/camera-box/Web_App_Integration/app.py
WorkingDirectory=/home/pi/camera-box/Web_App_Integration/
StandardOutput=inherit
StandardError=inherit
Restart=always
User=pi
Type=idle

[Install]
WantedBy=multi-user.target
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sudo chmod 644 /etc/systemd/system/startWebApp.service

sudo systemctl daemon-reload

systemctl enable startWebApp.service

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Alternative way:

sudo nano /etc/rc.local
--------------------------------------------------------------------
#!/bin/sh -e

python3 app.py &

exit 0
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sudo chmod +x /etc/rc.local