The following is a guest post by Dylann Winn-Brown, who shows us a performant way to accomplish this design effect.
Whilst working on a client’s website recently, I was asked to replicate an effect like this.
Containers with background images which zoom within their container on hover, revealing more information.
This type of effect is notably used in portfolio-type situations where the design intends to show both visual and informational details.
There are many different possible methods
Zooming Background Images is a post from CSS-Tricks
via Reme Le Hane