[Theme] Invert Lite Changing header

I’m fairly new to looking into the code and all that and have been trying to figure it out myself but still cannot. I used the homepage template for my landing page and would like to somehow give the header image the same parallax effect with some text over it. If somebody could help or even just show me where in the code to look I would greatly appreciate it. What I would love is to be able to basically take the header from the hemingway theme and replace the invert header with that if at all possible.