Use NVR As Inexpensive Decoder?

I have 2 IP cameras in 2 holovision intercoms. I need to get the video from each of those to an older Crestron touch screen that only supports composite video. Wondering if anybody has used cheap NVRs instead of spending the bucks on decoders. I could probably get 2 Hikvision or OEM NVRs without hard drives for less money then the decoders that I have seen.

thoughts?

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