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2D SFML - Make shader use object instead of the window

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Hey, I've a minor problem that prevents me from moving forward with development and looking to find a way that could solve it. Overall, I'm having a sf::VertexArray object and looking to reander a shader inside its area. The problem is that the shader takes the window as canvas and only becomes visible in the object range which is not what I'm looking for.. 

Here's a stackoverflow links that shows the expected behaviour image. Any tips or help is really appreciated. I would have accepted that answer, but currently it does not work with #version 330 ...

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