Need help with masks

1

Hey everyone. I’m hoping that this will be a somewhat easy thing to do. I’m making this little interactive piece for an extermination company and I need to have 2 images on the stage. One is a normal image, and underneath is an identical infrared image showing mold damage. I need to create a draggable circle that will reveal the mold damage within the circle (like a microscope). I’m assuming that this effect is done with masking and I’ve been messing around with it all morning. Can anyone help me get headed in the right direction?