Big e-commerce players such as Amazon and Wal-Mart have dedicated untold resources to search engine optimization, ensuring they’ll always come out on top in online searches. But there’s one medium that’s still (somewhat) up for grabs on the Internet: video.According to video marketing expert Jessica Brace, videos have a 53 percent higher chance of landing on page one of a Google search than websites or non-video. Video “really is worth it when you look at the numbers,” she says: “76 percent of consumers are more apt to buy a product if they’ve seen a video.”And because producing videos for the Web can (and should) be free, it’s practically risk-free. “The biggest mistake retailers make is assuming it’s going to be expensive,” says Brace, who uses an iPhone to make most of her videos and recommends the free photo slideshow-creation tool on YouTube to create photo v