Green light has always been used to indicate that everything is good and the same is with the nest camera blinking green. After restarting you should see a solid green light on the front of your camera if its connected to your home wi fi network.

How To Hard Reset A Nest Thermostat E 2018 Guide
Nest green light blinking. About 10 minutes later blinky green light and unit in unresponsive. During this process the display will restart which usually only takes 1 2 minutes. Battery is too low to start. If it takes much longer time check to make sure the display is correctly connected to the thermostat base. It should automatically turn on when finished. If you see a yellow status light nest cam indoor and outdoor or yellow blinking light ring nest cam iq indoor and outdoor and nest hello your camera may have trouble connecting or theres insufficient power.
Removed it reconnected it to the pc and it wakes up again. A blinking green light will appear if the nest is turning on restarting or updating. A blinking green light near the top of your nest thermostats display means that its updating the software starting up or restarting. If the light is still blinking after reconnecting the device restart it by holding down the thermostat ring for 10 seconds. If your nest camera is blinking green then you should know that your nest cam is working properly and is connected to the internet and you can watch the live video feed. It should automatically turn on when finished.
But if this continues for longer than a few minutes see the article below for more troubleshooting. Typically this will only last a minute or two. Nest camera blinking blue. If the lights continue to blink for more than 5 minutes remove and reconnect the display. Hold down the ring for 15 seconds nothing. A small flashing green light on the nest thermostat display usually means that its updating software.
Give it a few minutes and then remove reconnect it nothing. Your thermostat has a green blinking light if a green blinking light suddenly appears it just means that your nest is automatically updating its software.