Why does jQuery#getJSON work outside of this closure?

cors_closure.js

// It seems my request is fine when its not wrapped in a closure, 
// but blows up with CORS errors when inside...

// The following works fine with no issues
var videoUrl = "http://vimeo.com/api/v2/video/75738368.json?callback=?"
$.getJSON(videoUrl, function (data) {
    console.log("Data: ", data)
});

Hist.VideoHandler = function() {
    return {
        getVimeoId: function(url) {
            var regex = /vimeo.com\/(\d*)/i;
            return url.match(regex)[1];
        },
        // The grabVimeoImage function fails after sending the request 
        // due to the following CORS errors:
        // OPTIONS http://vimeo.com/api/v2/video/75738368.json?callback=jQuery1830285762949148193_1380678929998&_=1380678930532 
        // Origin http://localhost:5000 is not allowed by Access-Control-Allow-Origin. 
        // 
        // Halp. 
        grabVimeoImage: function($urlContainer, vimeoId) {
            var videoUrl = "http://vimeo.com/api/v2/video/" + vimeoId + ".json?callback=?"
            console.log("Before $.getJSON");
            $.getJSON(videoUrl, function (data) {
                console.log("Data: ", data)
            });
        },
        updateVimeos: function($vimeos) {
            var self = this;
            $vimeos.each(function() {
                var $this = $(this),
                    dataUrl = $this.data('url'),
                    vimeoId = self.getVimeoId(dataUrl);
                self.grabVimeoImage($this, vimeoId);
            });
        },
        init: function() {
            var $vimeos = $('.vimeo_video');
            console.log("vimeos: ", $vimeos);
            if ($vimeos.length > 0) {
                this.updateVimeos($vimeos);
            }
        }
    }
}();