How to get the camera intrinsic matrix

Hello,
I’m using the Isaac gym camera and I want to know how to get the camera’s intrinsic matrix with local_transform?
my code is following:
cam_props = gymapi.CameraProperties()
cam_props.width = 640
cam_props.height = 480
cam_props.near_plane=0.001
cam_props.far_plane =100
cam_props.horizontal_fov = 60
cam_props.enable_tensors = True
local_transform = gymapi.Transform()
body_handle = gym.get_actor_rigid_body_handle(env, tiago_handle, 64)
gym.attach_camera_to_body(cam_handle, env, body_handle, local_transform, gymapi.FOLLOW_TRANSFORM)

Best regards,
xiaolin