Ffmpeg streaming

I generated my stream using ffmpeg with protocol rtsp

i generated a key with openssl with this command

sudo openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout /home/pi/SSL/httpd-selfsigned.key -out /home/pi/SSL/httpd-selfsigned.crt

the software generated two files: a key and a certificate.

How can i insert this files in the encoder (ffmpeg)?

The stream command is this:

./ffmpeg -re -i prova.mp4 -c:v h264_nvmpi -b:v 4000k -r 30 -ac 1 -ar 44100 -f rtsp -rtsp_transport tcp rtsp://x.x.x.x:443/live/a

The question is specific to using ffmpeg. May need ffmpeg experts to share you experience.
Looks like there is no official forum for ffmpeg. You may check

We have enabled hardware acceleration in video decoding. Please check development guide.