Air desktop app doesn't detect USB webcam anymore in HIGH SIERRA

Hello,

Since OSX High Sierra, the usb webcam are not detected anymore in our Air desktop application.

it worked well on former osX systems but since High Sierra system, our app doesn't detect any webcam anymore...

It's a real problem since our app is a capture app and without a detected webcam, it becomes completely useless...

We used flash.media.scanHardware and flash.media.Camera to detect the system cameras.

Is there a solution for this problem ?

Thank you in advance