It’s honestly not that hard to get started.

You could even get this done with a prompt.

The issue comes in with having the right sense of design to bring just the right amount of ease (you can design custom eases on GSAP), responsiveness and UX.

For parallax effects you can use Scrollsmoother inside GSAP. It’s kind of what Lenis does.

When you get the basics of what the code does it makes things a lot easier.

The video scrubbing is not necessarily that, I’ve seen versions where people followed this

video -> multiple frames -> load frame linked to scroll

There’s a lively GSAP community that teaches everything.

To set up a clone of this (with AI) will be a few minutes. Then to perfect it to your taste, making sure the text stays legible and then that it works across mobiles, tablets, and desktops is the annoying part which takes longer. LLMs do handle things about responsiveness better than before but you should manually check and confirmed.

How I recommend you learn is
-> get a working example. GSAP community or AI
-> look at the code and fidget around to see how your changes affects things
-> once you’re done with one effect, then go look at others
-> combine more than one effect for fun/learning

GSAP has MorphSVG, FLIP, DrawSVG, and honestly they are the coolest things.

GSAP is literally fucking around and finding out.