Added OpenCV Background Detector with 2 examples

Author: Vineet-Dhaimodker

OpenCV/Background_Detector/Background_Detector.py

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+import numpy as np
+import cv2
+
+# Uses Read video.py
+myVideo = cv2.VideoCapture('Sevilla.mp4')
+
+# Choose 100 random frames
+myFrames = myVideo.get(cv2.CAP_PROP_FRAME_COUNT) * np.random.uniform(size=100)
+
+frames = []
+for f in myFrames:
+    myVideo.set(cv2.CAP_PROP_POS_FRAMES, f)
+    ret, frame = myVideo.read()
+    frames.append(frame)
+
+# Average of frames
+bgFrame = np.median(frames, axis=0).astype(dtype=np.uint8)    
+cv2.imwrite("Sevilla_background.jpg",bgFrame)
+
+# Uses Readimg.py
+cv2.imshow('frame',bgFrame)
+cv2.waitKey(0)