How do i get mask on texture wherever user touched on their android screen?

OpenGL
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I’m new to OpenGL ES. I want user can select some portion of image by making green mark on that part.I posted a sample image below as an example.So, I just want to know Could i get this by fragment shader in android. If yes give me some hints or examples so that i can understand more about it

test
test403×527 260 KB

2

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