Add video tag to document

gistfile1.js

function createVideo( thumbnail, videoSource ) {
    var root = document.body

    var vid = document.createElement("video")
    vid.setAttribute("controls","controls")
    vid.setAttribute("poster",thumbnail)

    var src = document.createElement("source")
    src.setAttribute("src",videoSource)
    src.setAttribute("type","video/mp4")

    vid.appendChild(src)

    root.appendChild(vid)
}