Put the file from opencv-3.4.0 in /home/pi/opencv-3.4.0/samples/python
Put the file from adafruit in /home/pi/adafruit_python_pca9685/examples
Put the file from luma in /home/pi/luma.examples/examples
Enter the following commands to start the script
source ~/.profile
workon cv
cd /home/pi/opencv-3.4.0/samples/python
python starteye.py