[Plugin: WordPress SEO by Yoast] Video thumbnail on my post in Google

Hello,

Recently I installed the SEO by Yoast for my wordpress blog. Now after I migrated to your plugin, all the articles that I publish get a video thumbnail in the google search although there is no video in it. Here is a link for your reference – http://imageshack.us/a/img337/8453/techarta.jpg

How Do I rectify this? Almost all the articles published on my blog are now having that video thumbnail whenever I Google it.

http://wordpress.org/extend/plugins/wordpress-seo/