Figured a cheap way to have live view on a monitor Surveillance Station with Chromecast google tv and DS cam. Now going to try with a raspberry pi 4 with Andriod on
Synology Singapore - Synology Multimedia - DSM NAS
Synology adding Chromecast streaming to NAS boxes - SlashGear
DS video | Android - Synology Knowledge Center
Chromecast : configurer la clé avec Video Station et un NAS Synology | AEM Blog