'Returns HTML string to embed the video in an iFrame.'

@staticmethod
def recompose_video_tag(video_key):

    result = None
    if video_key:
        result = (('<iframe    title="YouTube    Video"    width="560"    height="315"    src="//www.youtube.com/embed/' + video_key) + '?rel=0"    frameborder="0"    allowfullscreen=""></iframe>')
    return result
