When it comes to using camera events to trigger an automation script, Google gave a few examples of potential use cases. Package delivery alerts, for example, can now be used as starters, which you could then use to trigger an announcement on your speakers and/or flash your lights. Detecting a known familiar face, meanwhile, could be used to turn on the lights and/or play welcome music. It can even detect the presence of your dog, which can then be scripted to trigger the “play[ing of] calming music to help your dog relax” or start playing “a dog-friendly TV show” on your TV running Google TV.
Custom notifications, meanwhile, are more or less self-explanatory. Google’s examples include being told that your kids have gotten home, that you left a device on and should turn it off to save energy, and, of course, that your security system has been tripped. For starter suppression, the provided examples include a buffer period if you have your doorbell set to ring when someone walks by your door at night or make sure that a motion trigger to open your blinds only goes off the first time you walk past the sensor each day.