iOS Smart App Banner plugin displays the app banners in Safari on iOS. All you need is your application ID.
iOS Smart App Banner is a plugin that allows you to take advantage of a new feature in iOS6+, where by placing a special tag will tell mobile Safari to open a banner at the top of the page, pointing to your app in the app store. This is an invaluable tool to help visitors find your app with as little friction as possible. This plugin also supports custom scheme + launch values.