Detecting Face from IP Camera encrypted Video Stream using OpenCV and provide gui application

While using OpenCV to capture Faces from Video from IPCamera , we can use the RTSP URL to read the stream like below rtsp://user:passxx@[login to view URL] The problem is that , we can set the stream as Encrypted from IP camera console and the key is entered for decrypting the video stream. I need a fix to read the encrypted stream and a small opencv GUI application which detects face from camera ( reading the above rtsp Url ) and save it as an image. This time the stream is encrypted. I can provide u the key for decryption used at the time of setting encrypted stream. IMP: BID ONLY IF YOU KNOW HOW TO DECRYPT AN ENCRYPTED STREAM. JUST READING FACE FROM VIDEO IS NOT ENOUGH.