Face recognition and tagging known faces in a video in opencv

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Hi, For online face recognition, I used the following link. http://www.shervinemami.info/faceRecognition.html

But the problem I am facing is, 1. How do I start online training for more than one person? 2. I tried training one person after another by giving different names. But when I start testing, if the two persons come at a time in video, it is displaying the same name for both persons in the video.

Can anyone help me? I am not able to move ahead after this.

My ultimate goal is to recognize people in a video and tag them with their names.