[nemetroid]

To me, asking the operating system's video abstraction layer seems cleaner than asking the device's binary blob.

[nixpulvis]

But will less confidence.

[nemetroid]

Rather the opposite. Unless you're trying to figure out if the device is capturing video and sending it somewhere else - but even then, a device behaving like that wouldn't be honest about it's status anyway.

[nixpulvis]

More points of failure.