How to automatically add a server hook after project creation

Hi all,

I’ve created a new group and I’d like to automatically add a server side hook for every new project that it’s created under this group.

Is there any way for doing that?
Is there any special process that happens after project creation that I could hijack so I could deploy the custom_hook?

Gitlab 10.5.4 CE.

Many thanks in advance,
Arnau