Got it fixed few months back when I encountered same issue while import cv2 in python, followed the steps mentioned by Biks in this stackoverflow thread https://stackoverflow.com/questions/43184887/dll-load-failed-error-when-importing-cv2, and it got resolved
1.Turn windows features on or off
2.Skip the roles screen and directly go to Feature screen
3.Select “Desktop Experience” under “User Interfaces and Infrastructure”
forgot to update this thread as it’s been quite a while