Camera permission reprompt not working with jitsi android sdk

Hello,
I have created a Jitsi custom sdk for android and added it to a sample android project. after running the application i deny the camera permissions. there after if i click on unmute video button, its not reprompting for camera permission.

if i enable camera permission in settings then also, mute/unmute video and audio is not working.

i am also using camera feature on native side. is there any clash.
can anyone help me with this?