How to capture screen of an windows application using MATLAB?

I tried to use Java Toolkit as per few threads posted regarding screen capture. But it is capturing any application which is presently running on desktop. (Not as background application)

robo = java.awt.Robot;
t = java.awt.Toolkit.getDefaultToolkit();
rectangle = java.awt.Rectangle(t.getScreenSize());
image = robo.createScreenCapture(rectangle);
filehandle = java.io.File('screencapture.jpg');
javax.imageio.ImageIO.write(image,'jpg',filehandle);
imageview('screencapture.jpg');

I want to grab the screen of a Particular application (running in system, running in background) and record the screen using MATLAB. I.e. A video is running in media player (minimized) and I want to record the entire frame playing in media player at a certain instant.