You can now add Google Hangouts Meet DIRECTLY in to your Canvas class. You can add it anywhere but if you want students "live" it may be best add to your calendar if you want students to know when your it is. In my example below I added it to a page, but you can add it to most editable items in Canvas. It is just a code/link for them to click.
UPDATE on 3/30 I do not see the external tool icon in the calendar editing box. I would make a page with YOUR hangout info on to store... Then make a calendar item and copy and paste YOUR hangouts info into the text box.
UPDATE on 3/30 I do not see the external tool icon in the calendar editing box. I would make a page with YOUR hangout info on to store... Then make a calendar item and copy and paste YOUR hangouts info into the text box.