There is no CAMERA command in the mac versions of AutoCAD.

Here are some workarounds if you need just the results and not that exact tool:

https://forums.autodesk.com/t5/autocad-for-mac-forum/camera/m-p/11944494#M45932 

BUT... if this is a dire business need, you will need to install and use the WindowsOS version of AutoCAD (yes, on your MAC), which is free with your active AutoCAD subscription to do. 

HTH