docs: def load_cams(conf_file):
      """Reads cams conf from file and intantiate appropiate classes.
      Returns: an array of IpCam classes."""
      with open(conf_file, "r") as c_file:
          lines = c_file.readlines()
      cams_conf = [json.loads(j) for j in lines]
      cams = []
      for cam_c in cams_conf:
          init_params = __parse_args(cam_c)
          cams.append(cam_types[cam_c["type"]](**init_params))
      return cams