Ya, I don't think the Spark app can record video or audio, though being a BT connection I don't see why it would prevent video recording while using the app, unless the audio monitor of the video were to conflict with the bluetooth audio stream into the amp.
It's pretty limited, but it does support voice command which requires permission to access the microphone:
Positive Grid released free new firmware and app updates today. Three new amps and three new pedals. You can go to the Positive Grid website, go to Spark under Amps, scroll down to updates (under the picture of the amp), and click on the links in "Announcing the Spark Gear Drop". Easy.
As much as I appreciate the new update I have to pose the question...
Why in the Hades did Positive Grid choose the Blues Junior out of all the amp possibilities? Wouldn't have been on my radar of amps to emulate for sure. Not that the model is bad, just unwarranted lol.