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https://docs.opencv.org/master/d2/d8d/classcv_1_1Stitcher.html#a37ee5bacf229e9d0fb9f97c8f5ed1acd

both VideoCapture.read() and Stitcher.stitch() return a tuple of results. you need code like this:

left_img, left_ok = leftStream.read()
right_img, right_ok = leftStream.read()

if not left_ok:
    print("left cam failed")
    return

if not right_ok:
    print("right cam failed")
    return

status, result = stitcher.stitch([left_img, right_img])