[Tutor] Error in get pixel value in coordinate (x, y) using getPixel(x, y)

[Whees Northbee]

I'm so sorry for late reply, my laptop broken, the code actually I already
put in thread before so I'll copy to here..
I don't know how to get pixel, I just searched and many link using
'getPixel' to get value of pixel..
I know color frame using 3 channel B G R to get pixel, but I just want to
get pixel value in 1 channel, they said I need to use video in gray scale,
and I already convert my video to gray scale
Here's the code:

cap              =cv2.VideoCapture("c:\Users\Shiloh\Videos\AVI\MOV_5675.avi")
width            =cap.get(cv2.cv.CV_CAP_PROP_FRAME_WIDTH)
height           =cap.get(cv2.cv.CV_CAP_PROP_FRAME_HEIGHT)

NUM_SAMPLES      =20
RADIUS           =20
MIN_MATCHES      =2
SUBSAMPLE_FACTOR =16

c_xoff= [-1,  0,  1, -1, 1, -1, 0, 1, 0]
c_yoff= [-1,  0,  1, -1, 1, -1, 0, 1, 0]

while(1):
    #Assign space and init
    m_samples=[]

    #height, width, depth=cap.shape
    c_black=np.zeros( (height,width), dtype=np.uint8)
    for i in range(0,NUM_SAMPLES,1):
        m_samples.append(c_black)

    m_mask=np.zeros( (width,height), dtype=np.uint8)
    m_foregroundMathCount=np.zeros( (width,height), dtype=np.uint8)


    # Capture frame-by-frame
    ret, frame = cap.read()


    #Init model from first frame
    for i in range(0,width,1):
        for j in range(0,height,1):
            for k in range(0,NUM_SAMPLES,1):
                random=np.random.randint(0,9)

                row=i+c_yoff[random]
                if(row<0):
                    row=0
                if(row>=width):
                    row=width-1

                col=j+c_xoff[random]
                if(col<0):
                    col=0
                if(col>=height):
                    col=height-1

                m_samples[k][i][j]=getPixel(frame,row,col)
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