If you use Chrome, try this extension. It allows you to quickly create a new card from whatever tab you're using on your browser and there is also the option to attach the current page grabbing an image (if possible) to add as a card cover.
I use it for YouTube videos all the time and it works incredibly well! It grabs the thumbnail of the videos.
@Wim Lasoen I'm afraid you've written in the wrong thread because I mentioned a Chrome extension, which means it requires you to use Google Chrome as a browser. Mac/iOS/iPad/iPhone aren't relevant for the Chrome extension.
I would recommend you to directly contact Trello's customer service here: https://trello.com/contact
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