crop and rotate area of an image bounded by a rectangle from example "Face Detection and Tracking Using the KLT Algorithm"

I want to be able to crop and rotate an area of interest from an image bounded by a rotated rectangle. The code I am using is the one posted under "Face Detection and Tracking Using the KLT Algorithm". I tried using imcrop but it only allows to use straight rectangles.

[Walter Roberson]

Duplicates http://uk.mathworks.com/matlabcentral/answers/255186-crop-and-rotate-face-from-example-face-detection-and-tracking-using-the-klt-algorithm