Here is a simple zoom hover/touch effect for images by Marcel. When you hover over a section of the image you get a nice little cartoony pop effect and then see the image as if you are looking at it through a magnifying glass.
If you are having trouble with the pen, try the archived copy on GitHub
Magnifying Glass Zoom Snippet
See the Pen magnifying image view with zoom 🔍 +touch support by creme (@creme) on CodePen.default