Added support for HTML5 video files
Added support for HTML5 video files - mp4, webm, ogv. All the ways to add files to the gallery define video files. For the video tag, according to the HTML5 specification, you need to specify the poster attribute - an image that will be shown as a splash screen before the video starts playing. The poster image file for the video must have the same name as the video file itself and be located in the same folder. Then the plugin will find and use it automatically.