Twenty Eleven

Recommended slideshow size: 1000 x 300. Go to Appearance > Editor. Select header.php from the right. Find (line 81):

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    if ( $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 ( $header_image ) :
 

Save.