Applying CATransitions — won’t work with vibrancy

MainWindowController.swift

//
//  MainWindowController.swift
//  Heartbeat
//
//  Created by Aral Balkan on 07/02/2015.
//  Copyright (c) 2015 Ind.ie.
//  Released under the MIT license.
//

import Cocoa

class MainWindowController: NSWindowController {

    override func windowDidLoad()
    {
        super.windowDidLoad()
        
        NSNotificationCenter.defaultCenter().when(youGet: "FadeOutMainWindow", call: "fadeOutMainWindow:", on: self)
    }
    
    func fadeOutMainWindow(notification:NSNotification)
    {
        println("Fade out main window notification received from Main Window Controller.")
        showDisabled()
    }
    
    func showDisabled()
    {
        //
        // With thanks to Cocoa With Love / Matt Gallagher (http://www.cocoawithlove.com/2011/05/presenting-mac-dialog-sheet-with-visual.html)
        //
        
        // Don’t forget to set self.view.layerUsesCoreImageFilters = true on the view
        
        println("Showing main window as disabled…")
        
        let animation:CATransition = CATransition()
        animation.type = kCATransitionFade
        
        if let window = self.window
        {
            if let layer = window.contentView.layer?
            {
                layer.addAnimation(animation, forKey: "layerAnimation")
                
                if let bounds = window.contentView.bounds
                {
                    let blankingView = NSView(frame: bounds)
                    window.contentView.addSubview(blankingView)
                    
                    let exposureFilter = CIFilter(name: "CIExposureAdjust")
                    exposureFilter.setDefaults()
                    exposureFilter.setValue(-1.25, forKey: "inputEV")
                    
                    let saturationFilter = CIFilter(name: "CIColorControls")
                    saturationFilter.setDefaults()
                    saturationFilter.setValue(0.35, forKey: "inputSaturation")
                    
                    let gloomFilter = CIFilter(name: "CIGloom")
                    gloomFilter.setDefaults()
                    gloomFilter.setValue(0.75, forKey: "inputIntensity")
                    
                    if let blankingViewLayer = blankingView.layer
                    {
                        blankingViewLayer.backgroundFilters = [exposureFilter, saturationFilter, gloomFilter]
                    }
                }
            }
        }
    }
}