Like I said to the British Gas man who was trying to sell me that "Hive" automated thermostat thing: "If I can change the heat in my house from my phone when I'm at work, someone else can do that to my house too".
So while I plan on putting CCTV in my home, it'll be on a device that can only be accessed in the home and not connected to the internet. That's literally the most secure way to run these cameras.