Use FitVids for video embedding

HTML5 Video Embedding

HTML5 has simplified video embedding, but designers still have two problems. The first is getting video to resize responsively, the second is to ensure resizing degrades gracefully for Flash when HTML5 embedding isn't supported. Enter FitVids, a jQuery plugin that takes care of all that for you.

Thanks to the guys at Creative Bloq -  http://www.creativebloq.com/web-design/tips-812580