how to use emc2 linked with external software

Hello,

I am building a small cnc 3 axis, with a hobbycnc card that I control with EMC2.
My main goal is to make an animated film. I put my digital camera on this machine.
I have written a small program in C + +, using the gphoto2 and ffmpeg library.
This program allows me to take a photo, bring it into the computer and then writing it to the end of a video file.
Now I'd like to move my camera a few steps, take a picture, put it to the video file , move a few steps, take a picture automatically....

My question:

Is it possible to write (in the gcode) a statement that would launch an external application.
Or is it possible to send an external instruction to advance emc2.

Thanks

Thanks,
that was exactly what i am looking for.

Sounds like a pretty cool application. Let us know how your project develops.

Brian