Can you use various cameras with nest hub

[Wmh]

Can u use existing cameras with this home system . I was wondering if I had to purchase a whole new security camera system of if they could also be used. I  have 2 different systems. Night owl and roku are they compatible? 

[David_K]

Some resources for you:

Viewing your Night Owl System Using Google – NightOwl SP
How to use Google to control your Roku Smart Home devices | Official Roku Support