Hey, in this video I will describe how to use camera zoom in After Effect
For this go to composition
new composition
change its background color if you want and press "OK"
I already have two images for demonstration
I will drag these in composition
now if you have done this then select both images layers
and scale like this
after this move one image to left
and second to right hand or as you like
now go to layer --> new --> null object
again to layer --> new  --> camera and press "OK"
and "OK"
Link your camera to null object by dragging spiral over null object
make all these layers 3D
now select null object and "P" to bring positions
drag your slider if you want, I will remain as it is
now click "Stop watch" to make a key frame
then drag your slider across to how long you want to take while zooming in
and then just zoom in by changing "Z" axis
adjust it like you want
zoom in it more
to make key-frame smooth select both key frames and press "F9"  or right click
and go to --> key frame assistant and click -->easy ease
and you can see it just zooms in nicely
and now if you want to zoom it out again then move your slider further
and set default values
so you can see it zooms out
zooming in
and zooming out
I hope this video helps you
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