if it helps the problem is in the function fluid_video_embed_from_url().
simply change the url code (starting line 394) to:
$iframe_url = '//www.youtube.com/embed/' . $this->meta['id'] . '?wmode=transparent&modestbranding=1&autohide=1&showinfo=0&rel=0';
$permalink = '//www.youtube.com/watch?v=' . $this->meta['id'];
$thumbnail = isset( $this->meta['full_image'] ) ? $this->meta['full_image'] : '';
break;
case 'vimeo':
$wrapper_padding = ( $this->meta['aspect'] * 100 ) . '%';
$iframe_url = '//player.vimeo.com/video/' . $this->meta['id'] . '?portrait=0&byline=0&title=0';
$permalink = '//vimeo.com/' . $this->meta['id'];
