Open NextGen Gallery by php code

Hello,

I have NGG pluging working on my demosite: https://blog.galeriakvetin.sk/svadobny-vzorovy-clanocek/

My clients want to start gallery by clicking on (featured) image in the begin of post.

Is there some php code to check if post have NGG gallery, and if yes – than add some to code that open gallery from post?

Thanks a lot

Hypo