Use createFakeElement to add placeholder for javascript gallery

Hello, do you now if is possible to user "createFakeElement" api and FakeElement plugin to embed a javascript gallery code? 

I have my piece of HTML that generate the gallery. I want to create a button that on submit add to the editor a FakeElement.

I'm not so skilled in js and I try to write this script but of course is not working.

	function newGallery()
	{
		var editor = CKEDITOR.currentInstance;
		var value = document.getElementById( 'gallery' ).value;
		var realElement = CKEDITOR.dom.element.createFromHtml( value );
		var fakeElement = editor.createFakeElement( realElement, 'cke_video', 'video', true );

		editor.insertElement(fakeElement);
	}