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please do not use threads to implement "state logic", you don't need this, and it's a terrible idea.

also, NEVER share data between threads (w/o locks) (esp. VideoCapture is NOT thread-safe), and NEVER have global variables in your program

all you need here, is a timer, not a seperate thread, you could use recording to keep the time like:

recording = 0 # not recording

in your contours loop:

    if area > 1000 and recording == 0:
        out = cv2.VideoWriter(path, fcc, fps, (width, height))
        recording = time.time() # start timer

then, later:

if recording > 0:
    out.write(frame)
    if time.time() - recording >= 10: # 10 seconds have passed
       recording = 0 # reset timer
       out.release()