gistfile1.php

//* Register widget areas
genesis_register_sidebar( array(
	'id'          => 'parallax-section-below-header',
	'name'        => __( 'Parallax Section Below Header', 'your-theme-slug' ),
	'description' => __( 'This is the parallax section below header.', 'your-theme-slug' ),
) );

genesis_register_sidebar( array(
	'id'          => 'parallax-section-above-footer',
	'name'        => __( 'Parallax Section Above Footer', 'your-theme-slug' ),
	'description' => __( 'This is the parallax section above footer.', 'your-theme-slug' ),
) );


//* Hooks parallax-section-below-header widget area after header
add_action( 'genesis_after_header', 'parallax_section_below_header' );
function parallax_section_below_header() {

	genesis_widget_area( 'parallax-section-below-header', array(
		'before' => '<div class="below-header parallax-section widget-area"><div class="wrap">',
		'after'  => '</div></div>',
	) );

}

//* Hooks parallax-section-above-footer widget area above footer
add_action( 'genesis_before_footer', 'parallax_section_above_footer' );
function parallax_section_above_footer() {

	genesis_widget_area( 'parallax-section-above-footer', array(
		'before' => '<div class="above-footer parallax-section widget-area"><div class="wrap">',
		'after'  => '</div></div>',
	) );

}

gistfile2.php

//* Enqueue parallax script
add_action( 'wp_enqueue_scripts', 'enqueue_parallax_script' );
function enqueue_parallax_script() {

	if ( ! wp_is_mobile() ) {

		wp_enqueue_script( 'parallax-script', get_bloginfo( 'stylesheet_directory' ) . '/js/parallax.js', array( 'jquery' ), '1.0.0' );

	}

}

gistfile3.php

//* Enqueue Sorts Mill Goudy Google font
add_action( 'wp_enqueue_scripts', 'custom_google_fonts' );
function custom_google_fonts() {

	wp_enqueue_style( 'parallax-google-fonts', '//fonts.googleapis.com/css?family=Montserrat|Sorts+Mill+Goudy', array(), CHILD_THEME_VERSION );
}

parallax.js

jQuery(function( $ ){

	$(window).scroll(function(){

		scrolltop = $(window).scrollTop()
		scrollwindow = scrolltop + $(window).height();

		// Section Below Header
		$(".parallax-section.below-header").css("backgroundPosition", "0px " + -(scrolltop/6) + "px");


		// Section Above Footer
		if( scrollwindow > $(".parallax-section.above-footer").offset().top ) {

			backgroundscroll = scrollwindow - $(".parallax-section.above-footer").offset().top;
			$(".parallax-section.above-footer").css("backgroundPosition", "0px " + -(backgroundscroll/6) + "px");

		}

	});

});

style.css

/* Parallax effect
--------------------------------------------- */

.parallax-section {
	background-attachment: fixed;
	background-color: #fff;
	background-position: 0px 0px;
	background-repeat: no-repeat;
	-webkit-background-size: cover;
	-moz-background-size:    cover;
	background-size:         cover;
	text-align: center;
	font-family: 'Sorts Mill Goudy',sans-serif;
	color: #fff;
	font-size: 28px;
	padding: 190px 0 200px;
}

.parallax-section .widget-title {
	font-size: 72px;
	margin-bottom: 40px;
	color: #fff;
}

.parallax-section.below-header {
	background-image: url("images/bg-1.jpg");
}

.parallax-section.above-footer {
	background-image: url("images/bg-2.jpg");
	color: #000;
}

.parallax-section.above-footer .widget-title {
	color: #000;
}