cool! I think it's a great idea. What is your store? I think that if you can specify this detail it will be easier to find a professional developer for that type of videos, but you can always find professionals of that type by doing a Google search

I suppose that a development team of this type can be found by doing a Google search, in the same results several companies dedicated to it should appear, you would have to see one by one which is the one that best suits your needs

what you say is very true, having a good design in Shopify not only makes you stand out from the rest but also gives you a personality with unique characteristics, that's why it's always good to see the work of the designer you hire beforehand, to see if it works according to what you are looking for, I can recommend this designer https://www.makebecool.com/services/shopify-design-ux he will be able to develop the work perfectly as you are looking for it

heat maps are usually widely used but mostly by experienced people or very involved in that subject, average people have no idea what it even means, look for more information in google search, there you have thousands of amounts of data of information regarding this

console games are my favourites, I am one of those who prefer to play on a console than on a PC, I know that for many this is the other way around, but I prefer it that way, the console is already predefined to run the game at maximum performance possible, it's just putting the game and playing, nothing more than that, but anyway, it's taste, have you tried to find a developer on a page of console game developers? because I think there are web pages that are specifically about supply and demand for console game developers