Stick Augmented Content When Detected

Hi, 

I am using Object detection feature of Vuforia to detect my CPU box. Once the box is detected, I want to place some AR content on it. For example, I want to show arrow call-outs from different ports of the CPU. Is there any way to stick the call-outs to certain place so that even when the camera position is changed, the callouts will remain to the same position where it was before. Or is there any way to re-size automatically the AR content (eg. arrows) when the phone is zoomed in or out. Please help me to achieve this case. 

Thanks & Regards, 

Meghaksh