nvvideoconvert crashes on RTSP input + src-crop=x:y:w:h pipeline

Hi all,
I am trying to crop the rtsp input to my deepstream yolo app to zoom into a certain part of the image before inference.

I tried to use this plugin [nvvideoconvert] in the configuration file deepstream_app_config file ?

[nvvideoconvert]
src_crop =0:0:320:200

with no effect.

Am I doing something wrong?

How can I use the nvvideoconvert plugin in the config file ?
Thanks in advance