Adding sticky text block while having individual word changing

Hello, 

I am wondering if anyone can point me in the right direction, currently not started the build on the site yet but the client has seen this action on the site - https://forner.studio/

Where the text is sticky on the right hand side while scrolling through images on the left, which is fine as I think I have seen either a plugin or custom code enabling sticky sections in vertical scroll. 

The code I would be trying to work out would be how to have the individual word within the text also change depending on scrolling height? The site I am referencing is above and below is a screen shot of the section I was referring too. 

Making that text sticky within the section isn't too difficult, Custom CSS like this targeting the FE block ID:

@media screen and (min-width:768px) {  
  .fe-block-09dfbdc20905a12cdcd8 {
    position:sticky;
    top:60px;
  }
}

To have the word change, there are plenty of plugins available, but I don't recall one that changes based on scroll position.