How to configure nginx for frontend and backend versioning?

Question

Nginx

Project structure:
/var/www/site.devel/
- v1/
-- /backend
-- /frontend
- v2/
-- /backend
-- /frontend
When site.devel is requested , php scripts in /v1/frontend must be executed, respectively requesting site.devel/backend should execute scripts in /v1/backend. If the version is specified (site.devel/v2/ and site.devel/v2/backend/), then scripts from the corresponding folder should be executed. So far, only regulars are on my mind.
PS version static in your vN folder