I did not want to take the plugin code so I was wondering if someone had already managed to use plugin vertically. It's a shame on the part of this plugin can be used horizontally. Sorry for langage...
Here is a CodePen that solves this:
http://codepen.io/dapinitial/pen/xZaRqz
$(".owl-carousel").owlCarousel({
loop: true,
autoplay: true,
items: 1,
nav: true,
autoplayHoverPause: true,
animateOut: 'slideOutUp',
animateIn: 'slideInUp'
});