Skalla

Hi, I have two images and want to gradient mask between these images when I move my mouse in the horizontal direction. Similar what they have done on: https://www.msccruises.co.za/en-za/Discover-MSC/Cruise-Ships/MSC-Seaview.aspx#timeline In other words: Image 1 is displayed and as I move my mouse over the image from left to right it should gradient mask out Image 1 and show Image 2 as I move the mouse to the right. How can this be done with GSAP?