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if you really make it "equal halves", your video will look like shit, also text is more or less a "horizontal" thing, so i propose a slightly different idea:

#1: make a nice large empty image:
draw = np.zeros((480,800,3), dtype=np.uint8)

#2: resize the cam frame to 640x480 (keeping a decent aspect ratio)
frame = cv2.resize(frame, (640,480))

#3: blit it into the large img
draw[0:480, 0:640, :] = frame

#4: draw it
cv2.imshow("XXX", draw)

#5: update the window (should go *after* imshow())
if cv2.waitKey(1) & 0xFF == ord('q'):
    break

this will leave you with a 800x160 drawing space below the cam img, and another 360x480 region on the right

if you really make it "equal halves", your video will look like shit, also text is more or less a "horizontal" thing, so i propose a slightly different idea:

#1: make a nice large empty image:
draw = np.zeros((480,800,3), dtype=np.uint8)

#2: resize the cam frame to 640x480 (keeping a decent aspect ratio)
frame = cv2.resize(frame, (640,480))

#3: blit it into the large img
draw[0:480, 0:640, :] = frame

#4: draw it
cv2.imshow("XXX", draw)

#5: update the window (should go *after* imshow())
if cv2.waitKey(1) & 0xFF == ord('q'):
    break

this will leave you with a 800x160 drawing space below the cam img, and another 360x480 160x480 region on the right

if you really make it "equal halves", your video will look like shit, also text is more or less a "horizontal" thing, so i propose a slightly different idea:

#1: make a nice large empty image:
draw = np.zeros((480,800,3), dtype=np.uint8)

#2: resize the cam frame to 640x480 (keeping a decent aspect ratio)
frame = cv2.resize(frame, (640,480))

#3: blit it into the large img
draw[0:480, 0:640, :] = frame

#3.a: your text rendering into the "draw" mat
# (your code here !)

#4: draw show it
cv2.imshow("XXX", draw)

#5: update the window (should go *after* imshow())
if cv2.waitKey(1) & 0xFF == ord('q'):
    break

this will leave you with a 800x160 drawing space below the cam img, and another 160x480 region on the right