Augmented Reality Black Screen Problem

Hi guys
can any one help me with my problem which is i am trying to make an augmented Reality project with Vuforia and trying to use the video see through technique. first of all i am using unity 5.3.4 and Vuforia 5.5.9.
the problem is when i press the play button a black screen appears to both views but when i change the technique to optical see through it just work fine.
note: i didnt get any error message and the light of the camera that i am using to test the project is on which indicate’s that the camera is working
thanx in advance

Same here.
It’s black on the game view, but if i click on the camera i can see the preview correctly

I have the same problem even when I followed ur way
Thanx

Try changing Graphics API to OpenGLES2 and Rendering path to Legacy deferred… It solved in some phones, bur I’m noticing this issue on some phones even changing this settings… but maybe it helps you!