pub fn default_camera_available() -> boolExpand description
Best-effort probe for “is there at least one video capture device the OS will hand us?” (M-CAM.0 / AUT-254).
Spawns gst-device-monitor-1.0 Video/Source with a short timeout
and parses the output for at least one device line. Returns false
if the binary isn’t on PATH, returns false if no devices are
listed — never panics. Integration tests use this to skip cleanly
on a host without a webcam.