Twenty Twelve

Recommended slideshow size: 960 x 300. Go to Appearance > Editor. Select header.php from the right. Find (line 41):

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    if ( ! empty( $header_image ) ) : ?>
 

Replace with:

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    if (is_home() || is_front_page()) : echo do_shortcode("[metaslider id=123]"); // replace 123 with your slideshow ID
    elseif ( ! empty( $header_image ) ) : ?>
 

Save.

If you would like to display specific sliders on specific pages then replace the original code:

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    if ( ! empty( $header_image ) ) : ?>
 

With this:

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if (is_home() || is_front_page()) : echo do_shortcode("[metaslider id=123]"); // This is the homepage, replace 123 with your slideshow ID
    elseif ( is_page('page-slug')) : echo do_shortcode("[metaslider id=123]"); // Replace page-slug and 123 with your specific page slideshow ID respectively
    elseif ( is_page('another-page-slug','or-this-page','Or by page title')) : echo do_shortcode("[metaslider id=123]"); // You can add as many other pages as you like
    elseif ( ! empty( $header_image ) ) : ?>