HTML5, CSS - Resize Videos Dynamically Without Scripts.
Try resizing the window to see the effect.
HTML5 Video Tag
1. HTML5 Video Tag (mp4, ogg, webm video formats).
"YouTube" now added a simple option of the video URL in your embed code, just add the code "?modestbranding=1" or "&modestbranding=1" and the player will show without the YouTube logo in the control bar. Note: that a small "YouTube" text label will still show up in the upper-right corner of a paused video when you hover over the player. See the full list of the player’s possible parameters, and here’s an resizing example:
2. iFrame Video from YouTube without the YouTube logo.