Question: How to scale-crop from 20% at the top, and how to do it for videos too?

[AndroidDeveloperLB]

Currently we can choose to scale-crop from center (center crop) , from top, and other sides...

But what should I do to make it work for 20% from the top?

And what should be done to make it work for videos too?

I've asked about this here: https://stackoverflow.com/questions/54216273/how-to-have-similar-mechanism-of-center-crop-on-exoplayers-playerview-but-not/

Please, if you know how to do it, publish an answer. I will gladly grant the bounty if it works.