Simply click on the “share” link while on the youtube video page then click on “embed”. Now you can grab the correct url/link from the code which is everything inside the src attribute. This is the correct “embed” URL to use when creating lightbox style videos on the site.
To have your video auto play, simply add ?autoplay=1 to the end of the URL in order to auto play the video.
Remove Youtube Branding?
And if you want to remove the Youtube branding add modestbranding=1 to the URL