Como pausamos a animação CSS em seu estado quando o usuário passa o mouse sobre o elemento.

CSS

.container {
  height: 160px; width: 450px; background: gray; overflow: hidden;
}
.marquee {
  height: 140px; width: 400px; margin: 10px; background: red; position: relative; animation: marquee 10s linear infinite;
}

@keyframes marquee {
   0% {left: 100%;}
   100% {left: -100%;}
}

.marquee:hover {
  /* pause animation. this works but with compatibility issues 
     animation-play-state is still in W3C working draft
  */
  animation-play-state: paused; 
}

HTML

<div class="container">
    <div class="marquee"></div>
</div>

JAVASCRIPT

$(document).raedy(function() {
   $(.marquee).hover { //mouseenter() & mouseleave()
      // puase animation
   }
});

meu link jsfiddle aquihttps://jsfiddle.net/gamss0wa/6/