LightGraphix

I haven't used it yet, I jut search GG, for example this tool: 
https://www.image-map.net/
when you setting >> Show me the code > Copy code > Edit page where you want to add it in Squarespace > Add a Block > Choose "Code" from the list >> Paste the code.

Thank you! The one I'm working on now is better imo so I'll have to go back and fix my own later lol. But honestly just by searching thru the forums and learning the coding language myself from here a little bit. 
 
So for my site I used a combination of:
1- the main code telling the menu/header to change on scroll, and
2- defining the specific changes that take place on scroll (the icons and bar itself shrink to what size and how fast, then a second half defining what happens specifically on mobile devices) 
Heres the entire code I used to pull it off. Let me know if you want help adjusting it, or maybe if another person here on the forums can clean it up even more.
 
ENTIRE CODE:
//Menu style change on scroll header#header.shrink { background-color: black !important; transition: all 0.6s; } header#header.shrink a { color: white; opacity: 1; } header#header.shrink img { filter: invert(1); } header#header.shrink use { fill: white !important; stroke: white !important; } header#header.shrink .header-nav-folder-content a { background: #fffffff !important; color: white; } header#header.shrink .header-nav-folder-content { background-color: rgba(0,0,0,0.70) !important; } @media screen and (max-width: 767px) {header#header.shrink a { color: black; opacity: 1;} } //Menu Size and Icon Shrink @media screen and (min-width: 767px) { header#header img { transition: all 0.3s; } header#header.shrink img { max-height: 40px; transition: all 0.3s; } } //MOBILE Menu Size and Icon Shrink @media screen and (max-width: 767px) { header#header img { transition: all 0.3s; } header#header.shrink img { max-height: 30px; transition: all 0.3s; } .header * { padding-top: 2px !important; padding-bottom: 2px !important; } header#header.shrink { background-color: black !important; transition: all 0.4s; } }  
So in the first half of the code, it singles out the header and tells it what to do

Hi guys,
We made a custom Chrome extension that let you make Before After Image Slider without worrying about coding. No need to write a line of code! It works on 7.0 and 7.1.
Demo: https://www.sqsp.ixstudio.net/image-comparison
Free Download: https://chrome.google.com/webstore/detail/squarespace-ninja-kit-ext/klkcninekpnpemndealaeebjajmkabcf
Please check it and let me know your feedback. I'd love to add new and free elements on it!
Thanks.
Best,
Leopold

You can Google with keyword: Image Map

I did a quick demo, you can check
https://tuanphan3.squarespace.com/video-sticky-1?noredirect
pass: abc

The video section will be first section or?
If first, it will be easier, I can create a quick demo, then if you are okay, I will send code
With another position, you can add a section with Video Background then share site url, I will give some code to achieve similar effect (not same 100%)

hello! 
I offer digital marketing and web design services for small business owners.  Stepping out and working on my own rather than agency or in house positions has been a great new adventure. 
You can learn more at tinycoastdigital.com
Looking forward to learning about everyone's businesses 😊