Conclusion:
    Rectangle: 0.1~0.3 ms
	Gaussian:
		- with h: 9~10 ms
		- no   h: 5.5~7.2 ms

	But the performace has no differece when use color featur.
	So, choose Rect-kernel is enough.

1. mean_shift_video.avi
	- Test video for this program
2. mean_shift.h/cpp
	- Test the cost of two kernels: Gaussian vs. Rectangle
3. test_case.cpp
	- Add case for recording video.