Run OpenCV apps on boot up (Ubuntu)

run_on_bootup.md

0. Create your script,"script.sh" e.g.

#!/bin/bash

cd /home/wilson/opencv-starter-pack/python/basic
python open_video.py

1. Create your own service, .e.g Create a new file using your preferred text editor, vim, nano, gedit, use sudo if required
   sudo gedit /etc/systemd/system/faceapp.service

2. Paste this in your file and change accordingly

[Unit] 
Description=This service runs Face Recognition App upon bootup 

[Service] 
Type=oneshot 
ExecStart=/bin/bash "/home/wilson/script.sh" start 
ExecStop=/bin/bash "/home/wilson/script.sh" stop 
RemainAfterExit=yes 

[Install] 
WantedBy=multi-user.target

3. Change permission
   sudo chmod u+rwx /etc/systemd/system/faceapp.service

4. Enable the service
   sudo systemctl enable faceapp

Reference: https://stackoverflow.com/questions/47411763/raspberry-pi-autostart-opencv-script-error-with-cvimshow/47413583#47413583