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HTML 

              
                <header class="zoom">
	<img src="http://www.goodfreephotos.com/albums/iceland/other-iceland/aerial-view-of-a-river-in-iceland.jpg">
</header>
<main role="main">
	<div class="content">
		<h1>Zoom Hero Image on Scroll</h1>
		<p>Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et. Maecenas sed diam eget risus varius blandit sit amet non magna. Nulla vitae elit libero, a pharetra augue. Integer posuere erat a ante venenatis dapibus posuere velit aliquet.</p>
		<p>Curabitur blandit tempus porttitor. Integer posuere erat a ante venenatis dapibus posuere velit aliquet. Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.</p>		
		<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Distinctio temporibus laudantium reiciendis rerum? Sit odio veniam nemo praesentium culpa, quos recusandae consequuntur illum, ut soluta, repellat cum adipisci architecto libero?</span><span>Natus provident at sit excepturi, quo similique molestias consequuntur corporis aut aperiam accusantium non nihil dolores cum sapiente deleniti a error nemo molestiae laborum tenetur, laudantium harum? Ipsa, provident, vitae.</span></p>
		<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. A, beatae ullam consequatur repudiandae in, quibusdam, voluptatum nostrum temporibus, tenetur non debitis sint repellat facilis numquam. Nihil cumque doloremque rerum quod.</span><span>At quia quod necessitatibus blanditiis recusandae molestias suscipit cumque, iste, odit, illo impedit explicabo delectus pariatur harum. Necessitatibus maiores voluptas, fuga quia, earum minima fugit nostrum, nulla illo pariatur similique.</span></p>
		<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Adipisci ea amet modi magni harum, itaque officia repellendus alias libero, reprehenderit mollitia nulla hic? Cupiditate laborum, aspernatur amet temporibus a non!</span><span>Ex sequi, facere, eius laboriosam animi fugiat asperiores, non quis expedita placeat quas illo nihil vitae adipisci perferendis vero? Impedit alias quas consequatur commodi labore aliquid incidunt facilis voluptatem quam!</span></p>
		<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Optio tempore officiis, voluptatem ducimus sequi ut quasi harum quo ipsa nisi eveniet quis aliquid molestiae ipsum sed laudantium repudiandae dolores consectetur.</span><span>Adipisci, iure, odit. Ex aspernatur, quo laborum! Placeat in error officia quod mollitia laudantium, magni ducimus rerum minima, quos eveniet reprehenderit voluptate quibusdam veritatis dolorum, quas odit vero minus unde!</span></p>
		<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Repudiandae voluptatem, dolores! Deleniti, architecto, facilis? Quibusdam suscipit quod quasi ipsa ea, nam, nostrum blanditiis ullam sapiente non fugiat quos a mollitia.</span><span>Modi doloribus, hic voluptate quis rerum suscipit! Harum sint aspernatur quia tenetur in, amet est nemo sed provident dignissimos! Aut rerum dolorem quasi praesentium, voluptatibus aliquam accusamus enim alias fugit?</span></p>
		<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum quos magnam fuga, accusantium eveniet ea veniam magni. Ullam voluptatibus quam, aliquam quidem. Quia repudiandae magnam accusamus vel nihil expedita praesentium!</span><span>Dignissimos possimus molestiae, doloribus quos amet, incidunt facilis voluptate doloremque natus ab iste nulla consequuntur vero repellendus, saepe veniam ut voluptatem dolorum quidem magnam ducimus ea adipisci cum. Consectetur, veniam.</span></p>
		<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Explicabo obcaecati amet, dolorum ipsa rem. Perspiciatis explicabo fugit, tempore quae laudantium ex totam! Deserunt consequuntur, dolores sequi, animi voluptates repellendus porro!</span><span>Vero, repudiandae est doloremque saepe atque officia perferendis ducimus, facilis iste accusantium assumenda itaque cum! Tempora qui inventore excepturi accusamus voluptate sunt ipsum recusandae porro! Tenetur neque quaerat mollitia perferendis.</span></p>
		<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Accusantium modi sit adipisci, maiores molestiae autem omnis velit quidem veritatis facere a incidunt laboriosam corrupti, laudantium provident, iusto fuga nisi magnam?</span><span>Odit ipsum facilis nemo pariatur aliquam asperiores blanditiis sapiente modi eum, ea dolore animi est incidunt esse quisquam assumenda explicabo deserunt odio, possimus doloremque porro voluptates commodi aspernatur nostrum! Reprehenderit.</span></p>
		<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quo sapiente, labore, obcaecati consectetur illo ea, delectus deserunt odit ab incidunt asperiores quia. Labore harum, totam mollitia accusantium? Ullam, soluta, dignissimos.</span><span>Qui itaque suscipit similique dolor culpa. Quia sapiente molestias maxime cum provident error iure, adipisci maiores! Quas, exercitationem, recusandae? Temporibus dolorum excepturi alias voluptas voluptates dignissimos quod culpa illo expedita.</span></p>
		<p><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Molestias modi cumque hic ducimus natus aliquam corporis repellendus exercitationem nam animi obcaecati nemo, culpa non repellat aspernatur error facere alias quas.</span><span>Error amet, dolore exercitationem laboriosam possimus facere fugit id, saepe neque, recusandae explicabo totam nisi aliquam fugiat dolorum. Autem temporibus tempore tenetur numquam quo, modi in! Assumenda consectetur impedit ullam!</span></p>
	</div>
</main>
!

CSS 

              
                /* --- General Pen Styles --- */
body{
	font-family: Georgia, serif;
	color: #333;
	font-size: 18px;
	line-height: 24px;
}
h1{
	font-size: 50px;
	line-height: 1.125;
}
.content{
	margin: 0 auto;
	max-width: 90%;
	width: 720px;
}
main{
	padding: 1em 0;
	position: relative;
	background: #f5f5f5;
	box-shadow: 0px -10px 60px rgba(0,0,0,0.25);
}

/* --- Important Pen Styles --- */

.zoom{
	overflow: hidden;
	padding-bottom: 55%;
}
.zoom img{
	position: fixed;
	top: 0%;
	left: 50%;
	transform: translateX(-50%);
	
}
!

JS 

              
                $(window).scroll(function() {
	var scroll = $(window).scrollTop();
	
	$(".zoom img").css({
		transform: 'translate3d(-50%, -'+(scroll/100)+'%, 0) scale('+(100 + scroll/5)/100+')'
	});
});
!
999px

Console