<div class="blur-resim">
  <img src="resim1.jpg">
</div>

/*BLUR*/
.blur-resim {
  -webkit-transition: all 1s ease;
     -moz-transition: all 1s ease;
       -o-transition: all 1s ease;
      -ms-transition: all 1s ease;
          transition: all 1s ease;
}
 
.blur-resim:hover {
  -webkit-filter: blur(5px);
}