Yes, it is possible in Ecwid. On that example page the color is actually selected in the dropdown option, just like in Ecwid. The color swatches below look rather like a part of product description (which can also be done in Ecwid), and when you click any of them, their corresponding color is selected in the dropdown (which can be done in Ecwid too). So you can basically do the same thing by placing your images into the product description and create a JavaScript that will select the appropriate color in the dropdown when an image of that color is clicked.
If you need a custom programming service that will create such script for you, you can turn to our colleagues from Qualiteam - send the description of your project to
sales@qtmsoft.com for a quote.