YouTube will now let companies sell things on any video on its site

Companies will be able to buy visual ads with links to buy products on their own sites on any video on YouTube. 
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If you watch a lot of product reviews on YouTube, you'll start seeing a little "I" icon on the top-right corner of those videos. Click on that, and you'll see a visual list of products that are similar (or the same) as what you see in the videos.
For YouTube video creators, this new type of ad means they now have another potential revenue stream to monetize their videos.
http://uk.businessinsider.com/google-adds-new-youtube-shopping-ads-2015-9