Unable to access device camera using ffmpeg: Permi

Question

I am using a FFMPEG java wrapper for Android through which I am able to run any ffmpeg commands.

I have given my Android application the camera permission and the write external storage permission but ffmpeg is not able to access the device camera.

I am getting the following error when I run the command

  ffmpeg -re -f fbdev -r 10 -i /dev/graphics/fb0 -c copy -f flv rtmp://192.168.1.35:1935/app2/myStream 

  Error:     Could not open framebuffer device '/dev/graphics/fb0': Permission denied

How do I provide ffmpeg with camera access permission. I have tried giving chmod 777 /dev/graphics/fb0 but that does not work.

Can someone tell me a solution for this?