var OC = $("#owl-demo-featured").owlCarousel({
    path : 'path/to/json',
    onSuccess : function(r){
        if( r.length > 0 ){

            for( var i in r ){
                if( r.hasOwnProperty(i) ){
                    var $html = '';
                    // process you data with the template you want inject
                    OC.trigger('add.owl.carousel', jQuery($html) )
                }
            }
            OC.trigger('refresh.owl.carousel')
        }
    },
    onError: function(r){
        console.error(r);
    }
});