I'm trying to record a video of the augmented objects. Is there any built-in Vuforia recording function I can use?
No, Vuforia does not have a built-in video recording function. For this you'll need to search for 3rd party plugins or libraries (for instance, you may want to check in the Unity Asset Store too) or implement your own video recording.
One thing: how to grab a single image (screenshot) is explained here:
However this is only intended for images (screenshots), not for video.
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