How to create a gallery search bar

Hi everyone,

After researching a lot I’m really stuck on how to achieve this. I’m creating a stock image page on my website where people can search for an image e.g. “Horse” and the search will look through my gallery of stock images and display any images of horses. It seems simple enough but I can’t seem to find any plugins or code to achieve this so I was wondering if anyone had succeeded in doing something like this or knows how to do it.

Any help will be much appreciated!