You cant blur objects in InDesign, you have to do it in Illustrator or Photoshop.
You're talking about Lightbox effect where the primary dialog window is active and the background goes blurred. This feature is not present in InDesign. You might try Adobe Muse for such effect in your website. Adobe Muse has predefined and customizable LightBox effects which makes your job easier.
Oh..So sad! Anyway, thanks for info!
Then i try to make this effect with transition between two image, one of this will be blurred.