Does k230_linux_sdk have plans to build rtsp_pusher?

Currently, there are no plans for this feature. However, you can use ffmpeg to achieve this functionality:

ffmpeg -f v4l2 -input_format nv12 -r 30 -s 1920x1080 -i /dev/video1 -c:v h264_v4l2m2m -b:v 2M -vsync passthrough -f rtsp -rtsp_transport tcp rtsp://<your-rtsp-server-address>/*