Stream video over hdmi to another device

Hey guys,
I have Jetson xavier nx, I want to stream a local video from the jetson to another device over hdmi. so I have connected the hdmi of the jetson to the input of a video capture card and the output of the video capture card is connected to other device. the issue is when I read the video capture card I get the whole display of the jetson, not only the video. can you please guide me with how to stream the video only? I tried to use opencv with gstreamer but nothing worked.

HDMI out is the whole screen on display. For vide content only, we would suggest use UDP or RTSP. Please check the use-cases in Jetson Nano FAQ

Q: Is there any example of running RTSP streaming?
Q: Is there an example for running UDP streaming?

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