Every toy, gadget and good you see on YouTube could soon be for sale online – not on Amazon, but right on YouTube itself. The world’s largest video site recently started asking creators to use YouTube software to tag and track products featured in their clips. The data will then be linked to analytics and shopping tools from parent Google. The goal is to convert YouTube’s bounty of videos into a vast catalog of items that viewers can peruse, click on and buy directly, according to people familiar with the situation. The company is also testing a new integration with Shopify Inc. for selling items through YouTube.