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How to display 2D image in center of screen when target is detected?

How to display 2D image in center of screen when target is detected?

Here is what I would like to achieve - 

When marker is detected - image of screen crack should appear on screen ..- 2D image of crack should not move along with the marker. I want to just show it statically in the center of the screen when the marker is detected.

(I am fairly new to Unity as well as vuforia)