Question Flickering trees

I am working on a AR App where I have some trees that are flickering when you get close, how ever, the issue is not AR related. When I create a new screen just place a Tree inside and move the camera close, I am getting the same effect inside unity.
I was reading that some people had this issues in the past and they could fix it by adjusting the clipping planes, but that is not working for me. I have turn off all the lights, turned off all the shadows.. I tryed to bake the lights.. nothing seems to make any difference. It looks like flickering shadows but I dont think its related to light or shadows at all.
I hope somebody is familiar with the issue and can point me into right direction in order to fix this.
Here is a link to a movie of the issue I have: http://labs.wunderwerk.at/FlickeringAR.mov

 

I had same issue, I made the below tutorial, hope it can fix your problem: