Crop a video in python

Question

I am wondering to create a function which can crop a video in a certain frame and save it on my disk (OpenCV,moviepy,or something like that)

I am specifying my function with parameters as dimension of frame along with source and target name (location)

def vid_crop(src,dest,l,t,r,b):
  # something
  # goes
  # here

left = 1    #any number (pixels)
top = 2     # ''''
right = 3   # ''''
bottom = 4  # ''''

vid_crop('myvideo.mp4','myvideo_edit.mp4',left,top,right,bottom)

Any suggestions and ideas are really helpful