How to set up Motion on the Raspberry Pi Zero W
# Update the firmware and kernel modules
sudo rpi-update
# Create /dev/video0
sudo modprobe bcm2835-v4l2
# May need to upgrade Raspbian
sudo apt-get update
sudo apt-get upgrade
# Install Motion
sudo apt-get install motion
# Modify the Motion config file
sudo vi /etc/motion/motion.conf
# Run Motion
sudo motion