Voting starts in March for the Drupal Association Board election.
Since we have to comply with the Cookie law in EU, one of the services setting cookies is YouTube. The so called privacy-enhanced mode is acceptable by the law cause it sets cookies after the user starts playing video.
The change in embed code is very small - the src attribute must be from domain youtube-nocookie.com. All the rest is the same.
I found that the embed code is generated in video_embed_field.handlers.inc in function called video_embed_field_handle_youtube($url, $settings).
I'm not very experienced in creating patches but an extra setting and small modification in output could give this functionality. If someone is interested to help on this, I would appreciate it.