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After searching for a similar feature, this sounds like a user feature to implement, as opposed to something Gazebo would have a native implementation for.

For example, I wanted to gather images over a certain time period and make a video from them. The best solution I could come up with was to make a ROS node that subscribed to Gazebo node that constantly published the images. If a certain flag was true in my node, I'd save the image, and if it was false, I'd ignore the whole callback.

If you're not dealing with ROS, then you'll want to write a Gazebo plugin, which could do the above without the overhead of ROS. Check out the tutorials for more info.