Hello Reader!. If you want to show background image blur then you can use css. Lets's make a html page :-

<div class="background-image"></div>
<div class="content">
  <p>This is the para showing the content over the div. Behind this div the background image will be blur</p>

</div>

Now write the css for making the image blur:-

.background-image {
  position: fixed;
  left: 0;
  right: 0;
  z-index: 1;

  display: block;
  background-image: url('assignPathImage.jpg');
  width: 1200px;
  height: 800px;

  -webkit-filter: blur(5px);
  -moz-filter: blur(5px);
  -o-filter: blur(5px);
  -ms-filter: blur(5px);
  filter: blur(5px);
}

.content {
  position: fixed;
  left: 0;
  right: 0;
  z-index: 9999;
  margin-left: 20px;
  margin-right: 20px;
}