Google offers a Smart Home skill for integrating your Nest devices with Amazon’s Alexa home control.

With the Google Nest skill for Amazon Alexa, you can do things like:

• Tell Alexa to change the temperature of your home.
• Show your Nest camera’s live view on Alexa devices with a display.
• Get notified when someone rings the doorbell.
• Talk to a visitor through your doorbell.
• Have Alexa announce when your doorbell or camera detects motion.

The Google Nest skill for Amazon Alexa supports the following Nest devices:

• Nest cameras and doorbells
• Nest thermostats
  
  Here are the steps required.