People Detection and Tracking

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I want to do pedestrian detection and tracking.

Input: Video Stream from CCTV camera.

Output:

1. # people going from left to right
2. # people going from right to left
3. # No. of people in the middle

For pedestrian detection I am using HOG and SVM. After detection how to do I calculate the required values listed above. Can anyone tell me what is the tracking algorithm I have to use and any good algorithm for pedestrian detection.

Or should I use tracking algorithm? Is there a way to do without it?

Any references to codes/blogs/technical papers is appreciated.

Platform: C++ & OpenCV

--Thanks