cv2' has no attribute 'gapi_wip_gst_GStreamerPipeline'

During training i had this problem
```
cv.gapi.wip.GStreamerPipeline = cv.gapi_wip_gst_GStreamerPipeline
AttributeError: partially initialized module 'cv2' has no attribute 'gapi_wip_gst_GStreamerPipeline' (most likely due to a circular import)
```

It can be solved by: 
```
pip install opencv-python-headless==4.5.3.56
```