embed video in javascript code example

Example 1: how to add a video playing on a html page

<iframe width="420" height="315"
src="https://www.youtube.com/embed/tgbNymZ7vqY">
</iframe>

Example 2: embed video by javascript

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);