How to make a preview youtube video to the gallery?

// Grab the thumbnail of video from oembed get_video_thumbnail_uri function( $video_uri ) { $thumbnail_uri = "; // determine the type of video and the video id $video = parse_video_uri( $video_uri ); // get youtube thumbnail if ( $video['type'] == 'youtube' ) $thumbnail_uri = 'https://img.youtube.com/vi/' . $video['id'] . '/mqdefault.jpg'; // get vimeo thumbnail if( $video['type'] == 'vimeo' ) $thumbnail_uri = get_vimeo_thumbnail_uri( $video['id'] ); // get wistia thumbnail if( $video['type'] == 'wistia' ) $thumbnail_uri = get_wistia_thumbnail_uri( $video_uri ); // get default/placeholder thumbnail if( empty( $thumbnail_uri ) || is_wp_error( $thumbnail_uri ) ) $thumbnail_uri = "; //return thumbnail uri return $thumbnail_uri; } // Parse the video uri/url to determine the video type/source and the video id parse_video_uri function( $url ) { // Parse the url $parse = parse_url( $url ); // Set blank variables $video_type = "; $video_id = "; // Url is http://youtu.be/xxxx if ( $parse['host'] == 'youtu.be' ) { $video_type = 'youtube'; $video_id = ltrim( $parse['path'],'/' ); } // Url is http://www.youtube.com/watch?v=xxxx // or http://www.youtube.com/watch?feature=player_embedded&v=xxx // or http://www.youtube.com/embed/xxxx if ( ( $parse['host'] == 'youtube.com' ) || ( $parse['host'] == 'www.youtube.com' ) ) { $video_type = 'youtube'; parse_str( $parse['query'] ); $video_id = $v; if ( !empty( $feature ) ) $video_id = end( explode( 'v=', $parse['query'] ) ); if ( strpos( $parse['path'], 'embed' ) == 1 ) $video_id = end( explode( '/', $parse['path'] ) ); } // Url is http://www.vimeo.com if ( ( $parse['host'] == 'vimeo.com' ) || ( $parse['host'] == 'www.vimeo.com' ) ) { $video_type = 'vimeo'; $video_id = ltrim( $parse['path'],'/' ); } $host_names = explode(".", $parse['host'] ); $rebuild = ( ! empty( $host_names[1] ) ? $host_names[1] : ") . '.' . ( ! empty($host_names[2] ) ? $host_names[2] : "); // Url is an oembed url wistia.com if ( ( $rebuild == 'wistia.com' ) || ( $rebuild == 'wi.st.com' ) ) { $video_type = 'wistia'; if ( strpos( $parse['path'], 'medias' ) == 1 ) $video_id = end( explode( '/', $parse['path'] ) ); } // If recognised type return video array if ( !empty( $video_type ) ) { $video_array = array('type' => $video_type, 'id' => $video_id); return $video_array; } else { return false; } } //Takes a Vimeo video/clip ID and calls the Vimeo API v2 to get the large thumbnail URL. get_vimeo_thumbnail_uri function( $clip_id ) { $vimeo_api_uri = 'http://vimeo.com/api/v2/video/' . $clip_id . '.php'; $vimeo_response = wp_remote_get( $vimeo_api_uri ); if( is_wp_error( $vimeo_response ) ) { return $vimeo_response; } else { $vimeo_response = unserialize( $vimeo_response['body'] ); return $vimeo_response[0]['thumbnail_large']; } } //Takes a wistia oembed url and gets the video thumbnail url. get_wistia_thumbnail_uri function( $video_uri ) { if ( empty($video_uri) ) return false; $wistia_api_uri = 'http://fast.wistia.com/oembed?url=' . $video_uri; $wistia_response = wp_remote_get( $wistia_api_uri ); if( is_wp_error( $wistia_response ) ) { return $wistia_response; } else { $wistia_response = json_decode( $wistia_response['body'], true ); return $wistia_response['thumbnail_url']; } }