External CCTV camera recommendations

[Scones]

I'm looking to add my first CCTV camera to my Domoticz system and I'm looking for recommendations.

Looking at the WIKI it looks like Domoticz just takes snapshots when triggered. I was hoping to record the camera output.
Is it possible to have a CCTV camera that stores the output somewhere (I have an owncloud Rpi3 with a 2TB external HDD) but triggers Domoticz on sound / motion detection?

Other stuff like mobile phone notifications and 2-way comms would be nice but not essential. I already have Domoticz -> iPhone notifcations set up anyway, so could probably sort that myself.

I live in the UK, so a UK supplier would also be nice.

[mayyam]

I can't say about cameras, but for software, go for zoneminder, and zmNinja (zoneminder client) on smartphone and PC.

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may

[Scones]

Good call for ZoneMinder. I'm going to be looking at that, possibly putting in on my OnCloud, but triggering Domoticz.