gesture reconigition

Sorry for not clear concept.
Actually the thing i want to do is Accelerometer Based but not the IR on wiimote.
Here is the example.



I want to draw the gesture in the air but not facing to screen. You can see that the man just do the motion freely and no need pointing towards the screen.
I find a keyword " hidden markov model " which appear on the discussion on wiimote gesture reconigition.
I'm still finding more information about it
keep on guys :-)

remark: I hv finished to setup the computer la～