Create a new composition (320 x 240, duration 10:00)
Insert both the birds.mov and the magnifying glass.ai into the composition
Select your magnifying glass layer and hit A to bring up the Anchor point set the value to 56.0, 56.5 reason behind this is so that when we write the expression for bulge center the bulge center will be linked to the middle of our magnifying glass
With the birds.mov layer selected go to Effect – Distort – Bulge to add the bulge filter.
Set Bulge height to about 1.8
Select the magnifying glass layer and hit P and Shift S to pull up both position and scale
Select the birds layer and hit E to bring up the effects click the little arrow next to bulge to open up that filters options
Option/Alt click the stop watch next to Bulge Center to add an expression to it
Select the pick wipe (the middle icon that kind of looks like a pigs tail) and drag it to the magnifying glass position
Option/Alt click the stopwatch next to Horizontal and Vertical Radius and link them to the corresponding scale values on you magnifying glass you will need to divide both of these values by 2 so your expression should look like this thisComp.layer("Magnifying glass.ai").scale[0]/2
Set keyframes for both position and scale on your magnifying glass and enjoy.
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