how to apply effects to any shape of area of an xaml element or visual element?

[HppZ]

I want to apply effects to the blue area:

[HppZ]

using a Path with its Fill property set to a effect brush is a solution, but any other solution available?

[hawkerm]

@ratishphilip's got a solution for this, see above and below this header here in his docs: https://github.com/ratishphilip/CompositionProToolkit#3-creating-masked-backdrop-brush-using-imasksurface