Blur background behind MAAttachedWindow?

Question

Just curious if this is possible. Right now here is what a sample MAAttachedWindow looks like:

However, I want to know if I can blur the background behind the window, like this:

Is this possible without using private APIs?

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Request for code. Well, here's how MAAttachedWindow works. You just feed it a custom NSView, and it does the rest. So, here's how I was trying to make the blur:

CALayer *backgroundLayer = [CALayer layer];
[view setLayer:backgroundLayer];
[view setWantsLayer:YES];
CIFilter *blurFilter = [CIFilter filterWithName:@"CIGaussianBlur"];
[blurFilter setDefaults];
[view layer].backgroundFilters = [NSArray arrayWithObject:blurFilter];

Answer 1

No. You can’t do this without using private APIs. (Is my message 30 characters long yet?)