Ok, c'est bien l'appli avec le retour vidéo possible?
oops... désolé 
The video App is not yet mainstream and will be available after Joystick BT Commander V5.0 release
Not too familiar with FPV equipment...
Video is acquired by any standalone IP camera, or any Android device with integrated camera + IP webcam App
Stream is sent via WiFi to the App through a router (for IP cameras) or directly (for Android cameras)
I use this mini router
Did you already test Joystick BT Commander V4.0 ??