So there are 2 parts 1, if you just wanted to move hdmi over your existing network without having to run more cables, you can use HDMI over IP but 2, in your case you specifically want to be able to watch the stream. Simplest way is to connect the NVR/DVR to the network and use the RSTP/mobile app to view it The other way involves using a captcha card to captcha the HDMI signal and transmit it. - this can be costly though