Need help to find some information about this pinball mod

I am looking for information how to do this.
from 2:15 to 2:37
looks like he was able to use a pi zero to create a dynamic backglass what work with the original PCB.
youtube.com/watch?v=aSSZ9gokAUg&fbclid=IwY2xjawQ8zc5leHRuA2FlbQIxMQBzcnRjBmFwcF9pZBAyMjIwMzkxNzg4MjAwODkyAAEeozbMw7bsCxMoXSr6iH4dxgrxhI1yjw7WQfEFBjX0m7fJvUAo4Xh71Tbvnro_aem_tf0hQCnX2bz4uIkG56mg5Q