With Looop Player, you can turn your iPad into a kiosk that plays video selected by you over and over again.
Transfer a video file via iTunes File Sharing, set the supported device orientations and youre good to go!
The device orientation will be enforced from that moment on and the iPad wont show any player controls so its perfect to for any sort of unattended installation (hint: you may want to turn Guided Access or Single App mode on to prevent your users from using any hardware buttons).
And when the time comes to show your customers different video, its trivial to swap the video file for a new one: just navigate to System Settings app, look for Loop Player and turn on the Reset option.