if( !function_exists( 'marstheme_query_posts_from_last_7_days' ) ){
    /**
     * @param unknown_type $args
     * @param unknown_type $block_id
     * @return multitype:multitype:string
     */
    function marstheme_query_posts_from_last_7_days( $args, $block_id = null ) {
        if( $block_id == 'your unique block ID' ){
            if( isset( $args['date_query'][0]['year'] ) && isset( $args['date_query'][0]['week'] ) ){
                unset( $args['date_query'][0]['year'] );
                unset( $args['date_query'][0]['week'] );
                $args['date_query'] = array(
                    array(
                        'column' => 'post_date_gmt',
                        'after' => '1 week ago',
                    )
                );
            }
        }
        return $args;
    }
    add_filter( 'mars_sc_videotube_args' , 'marstheme_query_posts_from_last_7_days', 20, 2);
}