scroll trigger change background

[vanduc]

hello everyone , i'm newbie with gsap 
and well , i have a task to do with some animation like this video below. when i scroll the broswer the background will chane like that, pls help me with this animation, it's so difficult 
thank you for your help

 

here is link video  https://drive.google.com/file/d/1EXQbuXdf5-W-QSglzzFz2_YMZruCrkKs/view?usp=sharing

[OSUblake]

Hi vanduc,

 

As we state in the forum guidelines we don't have capacity to investigate, recreate or explain how to create custom effects. 

 

We are more than happy to answer GSAP-specific questions though. So if you give this effect a go yourself and get stuck in the process, feel free to post a minimal demo here and we'll give you some advice on how to get closer to your goal.

 

[iDad5]

12 hours ago, vanduc said:

pls help me with this animation, it's so difficult 

I wouldn't think so from what I can see.
Without knowing your specific Task, I would advice you to first think of how you would achieve the animation itself. Layers  or masks come to mind.
maybe even video. Once you have the animation (as a timeline) connecting it to ScrollTrigger or maybe even (only) observer shouldn't be to hard.
 

Go step by step.