Reverse engineered version of Webflow's very own sticky section component found here: https://webflow.com/solutions/freelancers-agencies.

Details: - It's using a proxy div (4x) to call the 'Scroll In/Out of View' interactions -

There is custom code in the footer used for video playback controls (starting/stopping video at specific time based on scroll position) -

100% credit to Webflow team for design and implementation strategy