var obj = {"video": { "value": "<iframe title='YouTube video player' type=\"text/html\" width='640' height='390' src='http://www.youtube.com/embed/W-Q7RMpINVo' frameborder='0' allowFullScreen></iframe>" }} document.write(obj.video.value);
<iframe width="420" height="315" src="https://www.youtube.com/embed/tgbNymZ7vqY"> </iframe>