cv2.fillPoly画矩形

cv2.fillPoly函数用于填充多边形。虽然函数名中包含了"Poly"，但实际上它可以用来填充不规则的多边形，包括矩形。要使用cv2.fillPoly函数来画一个矩形，需要先定义矩形的四个顶点坐标，然后将这些坐标组织成一个数组作为函数的参数。例如，要画一个左上角坐标为(100, 100)，
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