Vimeo drop uploader to click uploader - dom

Question

im using vimeo drop uploader on my site. i got the uploder from
https://github.com/websemantics/vimeo-upload
its working well when i drop the image. but i dont know how to on click to open uploder window..
the uploder dont have the file input its only have the div
this is html
<div class="progress">
<div id="progress" class="progress-bar progress-bar-striped active" role="progressbar" aria-valuenow="46" aria-valuemin="0" aria-valuemax="100" style="width: 0%">0%
</div>
</div>
<div id="drop_zone">Drop files here</div>
and they use this script
<script>
function handleFileSelect(evt) {
evt.stopPropagation();
evt.preventDefault();
var files = evt.dataTransfer.files; // FileList object.
var accessToken = document.getElementById("accessToken").value;
var upgrade_to_1080 = document.getElementById("upgrade_to_1080").checked;
// Set Video Data
var videoName = document.getElementById("videoName").value;
var videoDescription = document.getElementById("videoDescription").value;
// Clear the results div
var node = document.getElementById('results');
while (node.hasChildNodes()) node.removeChild(node.firstChild);
// Rest the progress bar
updateProgress(0);
var uploader = new MediaUploader({
file: files[0],
token: accessToken,
upgrade_to_1080: upgrade_to_1080,
videoData: {
name: (videoName > '') ? videoName : 'Default name',
description: (videoDescription > '') ? videoDescription : 'Default description'
},
onError: function(data) {
var errorResponse = JSON.parse(data);
message = errorResponse.error;
var element = document.createElement("div");
element.setAttribute('class', "alert alert-danger");
element.appendChild(document.createTextNode(message));
document.getElementById('results1').appendChild(element);
},
onProgress: function(data) {
updateProgress(data.loaded / data.total);
},
onComplete: function(videoId) {
var url = "https://vimeo.com/"+videoId;
document.getElementById("video").value = url;
//var a = document.createElement('a');
// a.appendChild(document.createTextNode(url));
// a.setAttribute('href',url);
//
// var element = document.createElement("div");
// element.setAttribute('class', "alert alert-success");
// element.appendChild(a);
//
// document.getElementById('results').appendChild(element);
}
});
uploader.upload();
}
/**
* Dragover handler to set the drop effect.
*/
function handleDragOver(evt) {
evt.stopPropagation();
evt.preventDefault();
evt.dataTransfer.dropEffect = 'copy';
}
/**
* Wire up drag & drop listeners once page loads
*/
document.addEventListener('DOMContentLoaded', function () {
var dropZone = document.getElementById('drop_zone');
dropZone.addEventListener('dragover', handleDragOver, false);
dropZone.addEventListener('drop', handleFileSelect, false);
});
var elem = document.getElementById('drop_zone');
if(elem && document.createEvent) {
var evt = document.createEvent("MouseEvents");
evt.initEvent("click", true, false);
elem.dispatchEvent(evt);
}
/**
* Updat progress bar.
*/
function updateProgress(progress) {
progress = Math.floor(progress * 100);
var element = document.getElementById('progress');
element.setAttribute('style', 'width:'+progress+'%');
element.innerHTML = progress+'%';
}
progress
</script>
Can you help me on this how to i upload an video on click..
Demo https://github.com/googledrive/cors-upload-sample
Thanks