Note: You can also be asked to activate the Voice assistant where you will be asked to record "Ok Google" three times.
You can also watch this video for detailed information about Google Assistant
To check all the other details of the device use this link: Samsung Galaxy A6
Yes, the Samsung Galaxy A60 can record 4k videos as it supports video recording of 3840x2160 @ 30 fps.
To know about what is 4K video recording, you can check-
Check full device specifications Samsung Galaxy A60
Make sure, you have 50%+ battery and WiFi connection (or Data Pack).
You can check the full specs here: Samsung Galaxy A6