How can I make this sticky section, with reverse column scrolling effect

Hello, guys. Over the past few days, I've been attempting to reproduce a particular video effect, but with no success. I'm really eager to find out if this can be achieved with CSS only (although I'm quite certain it's not possible). If Vanilla JS is necessary, could you please outline the steps to accomplish it? Unfortunately, the original poster was unwilling to share the URL, making it impossible for me to examine the code. I did, however, come across a similar effect on CodePen, but my JavaScript skills aren't quite up to par to fully comprehend the jQuery used.
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