Decrypting CCTV UDP/TCP packets MITM

Been trying to decrypt my own CCTV traffic as a hobby where I’ve used various tools (wirehshark, ffcode and some other tutorials) but seems either my stream is very secure, or I’m not trying hard enough. The configuration is as follows if some can figure it out:
-DVR connected via ethernet to router
-router connected to Internet
-cameras are NOT IP ones
-DVR user/pass is used (no VLC solutions please unless you know the accounts)
-video streams stored on DVR and be be viewed directly on DVR or via remote Apps (iOS, Windows,etc) as long as you know the IP url/User/pass

ideas?