Background Image Effect Scrollover?

Hello Guys, im new here. I’ve searched through the Forums, but I am not even sure how this effect is called which im looking for.

Basically I would like to know if this is a plugin, a theme or how I can reproduce this effect. Below I will link 3 different Websites who all use this effect. I would appreciate any help. Thanks

https://www.tribunemedia.com/ (the header effect and the effect of the blue background picture if you scroll down (where the videos is on)…)

https://www.andreas-senn.com/
(the effect of the pictures of meals, which are not fixed in one place but “kinda” get scrolled through?)

https://www.senns.restaurant/

Same thing here. Picture of the restaurant & the meals who are not in a fixed place.
I hope you understand what im trying to stay, because English is not my first language.

2) Question:

Also I would like to know ( https://www.senns.restaurant/ ) how to create a Menu like this. Basically the website is all one big page but when you click on the Menu it slides outside and shows u the different navigation possibilities. When u click them, it navigates to the Information and closes itself automatically.

Appreciate your help!!