Anyway, I got it to work by using custom CSS:
.img-wrap{
height: 200px;
overflow: hidden;
position: relative;
}
.owl-carousel .owl-item .img-wrap img{
position: absolute;
left: -1000%;
right: -1000%;
top: -1000%;
bottom: -1000%;
margin: auto;
min-height: 100%;
min-width: 100%;
width:inherit;
height:inherit;
max-width:none;
}
