Vídeos Adaptables en Twitter Bootstrap

resp-video.htm

<!----- Este es el codigo CSS --- -->
<style>
.flex-video {
  position: relative;
  padding-top: 25px;
  padding-bottom: 67.5%;
  height: 0;
  margin-bottom: 16px;
  overflow: hidden;
}
 
.flex-video.widescreen { padding-bottom: 57.25%; }
.flex-video.vimeo { padding-top: 0; }
 
.flex-video iframe,
.flex-video object,
.flex-video embed {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}
@media only screen and (max-device-width: 800px), only screen and (device-width: 1024px) and (device-height: 600px), only screen and (width: 1280px) and (orientation: landscape), only screen and (device-width: 800px), only screen and (max-width: 767px) {
  .flex-video { padding-top: 0; }
}
</style>

<!-----  Este es el codigo html ----->

<div class="row">
  <div class="span6">
    <div class="flex-video widescreen"><iframe src="https://www.youtube-nocookie.com/embed/..." frameborder="0" allowfullscreen=""></iframe></div>
  </div>
  <div class="span6">
    ...
  </div>
</div>