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WOOwww. That cool! I Solved your problem. The error you getting at:

 c = max(contours, key = cv2.contourArea)

To fix problem: Put inside if/else condition block:

    if area>20000:
        cv2.drawContours(fg, contours, -1, (0, 255, 0), 3)

c = max(contours, key = cv2.contourArea)

x,y,w,h = cv2.boundingRect(c)
# draw the book contour (in green)
cv2.rectangle(fg,(x,y),(x+w,y+h),(0,255,0),2)

cv2.imshow('bg', bg)
cv2.imshow('fg', fg)
cv2.imshow('panel', panel)

to:

if area>20000:
    cv2.drawContours(fg, contours, -1, (0, 255, 0), 3)

    c = max(contours, key = cv2.contourArea)

    x,y,w,h = cv2.boundingRect(c)
    # draw the book contour (in green)
    cv2.rectangle(fg,(x,y),(x+w,y+h),(0,255,0),2)

cv2.imshow('bg', bg) cv2.imshow('fg', fg) cv2.imshow('panel', panel)

WOOwww. That cool! I Solved your problem. The error you getting at:

 c = max(contours, key = cv2.contourArea)

To fix problem: Put inside if/else condition block:

    if area>20000:
        cv2.drawContours(fg, contours, -1, (0, 255, 0), 3)

c = max(contours, key = cv2.contourArea)

x,y,w,h = cv2.boundingRect(c)
# draw the book contour (in green)
cv2.rectangle(fg,(x,y),(x+w,y+h),(0,255,0),2)

cv2.imshow('bg', bg)
cv2.imshow('fg', fg)
cv2.imshow('panel', panel)

to:

 if area>20000:
     cv2.drawContours(fg, contours, -1, (0, 255, 0), 3)

     c = max(contours, key = cv2.contourArea)

     x,y,w,h = cv2.boundingRect(c)
     # draw the book contour (in green)
     cv2.rectangle(fg,(x,y),(x+w,y+h),(0,255,0),2)

WOOwww. That cool! I Solved your problem. The error you getting at:

 c = max(contours, key = cv2.contourArea)

To fix problem: Put inside if/else condition block:

    if area>20000:
        cv2.drawContours(fg, contours, -1, (0, 255, 0), 3)

c = max(contours, key = cv2.contourArea)

x,y,w,h = cv2.boundingRect(c)
# draw the book contour (in green)
cv2.rectangle(fg,(x,y),(x+w,y+h),(0,255,0),2)

cv2.imshow('bg', bg)
cv2.imshow('fg', fg)
cv2.imshow('panel', panel)

to:

    if area>20000:
        cv2.drawContours(fg, contours, -1, (0, 255, 0), 3)

        c = max(contours, key = cv2.contourArea)

        x,y,w,h = cv2.boundingRect(c)
        # draw the book contour (in green)
        cv2.rectangle(fg,(x,y),(x+w,y+h),(0,255,0),2)

cv2.imshow('bg', bg)
cv2.imshow('fg', fg)
cv2.imshow('panel', panel)

capture = cv2.VideoCapture(1)

capture = cv2.VideoCapture(0)