if( !function_exists( 'mars_remove_cpt_slug' ) ){
    /**
     * Remove the slug from published post permalinks. Only affect our CPT though.
     */
    function mars_remove_cpt_slug( $post_link, $post, $leavename ) {

        if ( ! in_array( $post->post_type, array( 'video' ) ) || 'publish' != $post->post_status )
            return $post_link;

        $post_link = str_replace( '/' . $post->post_type . '/', '/', $post_link );

        return $post_link;
    }
    add_filter( 'post_type_link', 'mars_remove_cpt_slug', 10, 3 );
}

if( !function_exists( 'mars_parse_request' ) ){
    function mars_parse_request( $query ) {

        // Only noop the main query
        if ( ! $query->is_main_query() )
            return;

        // Only noop our very specific rewrite rule match
        if ( 2 != count( $query->query )
                || ! isset( $query->query['page'] ) )
            return;

        // 'name' will be set if post permalinks are just post_name, otherwise the page rule will match
        if ( ! empty( $query->query['name'] ) )
            $query->set( 'post_type', array( 'post', 'video', 'page' ) );
    }
    add_action( 'pre_get_posts', 'mars_parse_request' );
}