This app was mentioned in 2 comments, with an average of 1.00 upvote
Android: https://play.google.com/store/apps/details?id=com.billard&hl=en
iOS: https://itunes.apple.com/us/app/billard-aiming-calculator/id659876065?mt=8
Alternatively, Virtual Pool 4 with tracking lines on is very accurate for showing cue ball and object ball travel paths with and without spin.
I don't have a video to recommend but there's an android app called Billiard Aiming Calculator that shows lines and whatnot.