How to dynamic zoom a still image retaining size?

I have a slide show at the end of my video and I want to dynamic zoom the photos, but keep the size of the photos the same. If I add dynamic zoom, the photo size changes, but I need to keep the edges fixed because I have a fancy background behind them.
Can I do it without fusion? I was thinking maybe I need a mask or something?
Here's how my timeline looks
Can I do it without fusion? I was thinking maybe I need a mask or something?
Here's how my timeline looks