FitVids.js is a lightweight, easy-to-use jQuery plugin for fluid width video embeds. FitVids automates the Intrinsic Ratio Method by Thierry Koblentz to achieve fluid width videos in your responsive web design.
Have a custom video player? They have a customSelector option where you can add your own specific video vendor selector too. FitVids.js is released under the WTFPL license.
Requirements: jQuery Framework
License: WTFPL License