Image Blur

• can use a camera which render to a rendered texture
• add the images to be rendered to a second canvas, which uses the new camera with screenspace-camera
• Add blur shader to the Camera, or a parent object which contains all images
• Add the rendered texture to anywhere you like in the first camera

Dynamic Background Blur

• Blur Behind Window Use Camera post effect
• Dynamic Blurred Background on UI Use Grabpass
• http://blog.ivank.net/fastest-gaussian-blur.html