front-end.php

<style>
.showcase{
	background:url(<?php echo get_theme_mod('showcase_image', get_bloginfo('template_url').'/img/showcase.jpg'); ?>) no-repeat center center;
	}
</style>
<section class="showcase">
<div class="container">
<h1><?php echo get_theme_mod('showcase_heading', 'Welcome to Kevin Fonseca Wordpress Theme'); ?></h1>
</div>
</section>
<?php
// Tambien se pueden usar condicionales if. Ejemplo:
<?php if(get_theme_mod ('showcase_heading', 'Welcome to Kevin Fonseca Wordpress Theme') != '') : ?>
<h1><?php echo get_theme_mod('showcase_heading', 'Welcome to Kevin Fonseca Wordpress Theme'); ?></h1>
<?php endif; ?>
?>