В качестве альтернативы я нашел хорошую библиотеку: PyQtGraph - ROI .
Здесь хороший пример кода:
v3 = w3.addViewBox(row=1, col=0, lockAspect=True) # adds a content area
# to the existing layout
r3a = pg.ROI([0,0], [10,10]) #creates a bounding box which i need
v3.addItem(r3a) #adding it to the scene
## handles scaling horizontally around center
r3a.addScaleHandle([1, 0.5], [0.5, 0.5]) #append the box with dragable handles
r3a.addScaleHandle([0, 0.5], [0.5, 0.5]) #for nice resizing purposes
## handles scaling vertically from opposite edge
r3a.addScaleHandle([0.5, 0], [0.5, 1])
r3a.addScaleHandle([0.5, 1], [0.5, 0])
## handles scaling both vertically and horizontally
r3a.addScaleHandle([1, 1], [0, 0])
r3a.addScaleHandle([0, 0], [1, 1])