By installing YouTube Cinema Mode for WordPress you will be able to embed YouTube videos along with a button to “turn off the lights”, putting the web page in cinema mode.
YouTube Cinema Mode for WordPress provides an easy-to-use button on the WordPress editor toolbar. All you need to do is choose the style you like and paste the YouTube video URL!
Turn off the lights, activate cinema mode and get the Popcorn ready!
DEMO HERE: http://zerogallery.articnet.jp/youtube-cinema-mode/