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HTML 

              
                <header>
  <p>ScrollMagic Parallax Example</p>
</header>

<!-- Includes can be found in settings -->

<section id="parallax1" style="background-image: url(http://deghq.com/yapp/front-labs/codepen-assets/slide-1.jpg);" class="parallaxParent">
</section>

<section class="spacer">
  <div>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Accusantium tempora quasi iste facere placeat corporis commodi. Accusantium esse hic dolore assumenda facere libero, in repellat distinctio commodi blanditiis, quas, culpa?</p>
    <button class="toggleIndicators">Hide Indicators</button>
  </div>
</section>

<section id="parallax2" class="parallaxParent" style="background-image: url(http://deghq.com/yapp/front-labs/codepen-assets/slide-2.jpg);">
</section>

<section class="spacer">
  <div>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. In deserunt voluptate soluta architecto, quam et rerum cum temporibus enim, neque, quo ipsum error recusandae debitis nobis quibusdam perferendis dignissimos dolores!</p>
    <button class="toggleIndicators">Hide Indicators</button>
  </div>
</section>

<section id="parallax3" class="parallaxParent" style="background-image: url(http://deghq.com/yapp/front-labs/codepen-assets/slide-3.jpg);">
</section>

<section class="spacer">
  <div>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. In deserunt voluptate soluta architecto, quam et rerum cum temporibus enim, neque, quo ipsum error recusandae debitis nobis quibusdam perferendis dignissimos dolores!</p>
    <button class="toggleIndicators">Hide Indicators</button>
  </div>
</section>

<footer>
  &copy; :P
</footer>
!

CSS 

              
                header {
  width: 100%;
  height: 40vh;
  display: flex;
  align-items: center;
}

header p {
  margin: 0 auto;
  font-size: 5vh;
}

.parallaxParent {
  height: 600px;
  background-repeat: no-repeat;
  background-size: 200%;
  background-position: center -200px;
}

.spacer {
  padding: 200px 5vh 200px 5vh;
  max-width: 100%;
  margin: 0 auto;
  min-height: 600px; 
}

.spacer p {
  font-size: 3vh;
  margin-top: 200px;
}

button {
  padding: 10px;
  border-radius: 5px;
  width: 120px;
  height: 60px;
  display: block;
  margin: 0 auto;
}

footer {
  width: 100%;
  height: 200px;
  text-align: center;
}
!

JS 

              
                // init controller
var controller = new ScrollMagic.Controller({
  globalSceneOptions: {
    triggerHook: "onEnter",
    duration: "200%"
  }
});

var scene1 = new ScrollMagic.Scene({
  triggerElement: "#parallax1"
});
scene1.setTween(new TweenMax($("#parallax1"), 1, {
  backgroundPosition: "center 200px",
  ease: Linear.easeNone
}));
scene1.addIndicators();
scene1.addTo(controller);

var scene2 = new ScrollMagic.Scene({
  triggerElement: "#parallax2"
});
scene2.setTween(new TweenMax($("#parallax2"), 1, {
  backgroundPosition: "center 200px",
  ease: Linear.easeNone
}));
scene2.addIndicators();
scene2.addTo(controller);

var scene3 = new ScrollMagic.Scene({
  triggerElement: "#parallax3"
});
scene3.setTween(new TweenMax($("#parallax3"), 1, {
  backgroundPosition: "center 200px",
  ease: Linear.easeNone
}));
scene3.addIndicators();
scene3.addTo(controller);

indicatorsShown = true;

$(".toggleIndicators").click(function(event) {
  if (indicatorsShown) {
    indicatorsShown = false;
    $(".toggleIndicators").text("Show Indicators");
    scene1.removeIndicators();
    scene2.removeIndicators();
    scene3.removeIndicators();
  } else {
    indicatorsShown = true;
    $(".toggleIndicators").text("Hide Indicators");
    scene1.addIndicators();
    scene2.addIndicators();
    scene3.addIndicators();
  }
});
!
999px

Console