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you need an array of videocaptures then, not a single one.

#
#step 1, set up the captures:
#
caps = []
videoList=glob.glob(r'C:\Users\chaitanya\Desktop\Thesis\*.avi')
for path in videoList:
    cap = cv2.VideoCapture(path)
    if not cap.isOpened():
        print "error opening ", path
    else:
        caps.append(cap)
#
#step 2, iterate through videoframes, collect images, and stitch them
#    
while True:
    frames = [] # frames for one timestep
    for cap in caps:
        ret,frame=cap.read()
        if not ret:
              return # game over
        frames.append(frame)

    # stitch a new frame from frames
    # append to output video