Because this requires a template change, I’d advise that you setup a child theme. This allows you to make code changes that won’t be overwritten when an X update is released. After your child theme is setup, please review how we recommend making template changes in Customization Best Practices.

Copy _navbar.php from framework/views/global and put it in the same path inside child theme, now replace existing code with the following :

<?php

// =============================================================================
// VIEWS/GLOBAL/_NAVBAR.PHP
// -----------------------------------------------------------------------------
// Outputs the navbar.
// =============================================================================

$navbar_position = x_get_navbar_positioning();
$logo_nav_layout = x_get_logo_navigation_layout();
$is_one_page_nav = x_is_one_page_navigation();

?>

<?php if ( ( $navbar_position == 'static-top' || $navbar_position == 'fixed-top' || $is_one_page_nav ) && $logo_nav_layout == 'stacked' ) : ?>

  <div class="x-logobar">
    <div class="x-logobar-inner">
      <div class="x-container max width">
        <?php x_get_view( 'global', '_brand' ); ?>
        <?php echo do_shortcode('[rev_slider slider]'); ?>
      </div>
    </div>
  </div>

  <div class="x-navbar-wrap">
    <div class="<?php x_navbar_class(); ?>">
      <div class="x-navbar-inner">
        <div class="x-container max width">
          <?php x_get_view( 'global', '_nav', 'primary' ); ?>
        </div>
      </div>
    </div>
  </div>

<?php else : ?>

  <div class="x-navbar-wrap">
    <div class="<?php x_navbar_class(); ?>">
      <div class="x-navbar-inner">
        <div class="x-container max width">
          <?php x_get_view( 'global', '_brand' ); ?>
          <?php x_get_view( 'global', '_nav', 'primary' ); ?>
        </div>
      </div>
    </div>
  </div>

<?php endif; ?>

Instead of [rev_slider slider] put your slider shortcode.

Hope it helps.

cheers!

Cheers!