As I tried to show with these videos, I have a problem that objects getting darker and darker when my camera getting closer. I checked most of the settings with PostProcessVolume and Sunsky but nothing solved this problem. Is anybody faced with this problem?
You can turn off auto exposure in the post process volume by setting min and max ev to the same thing.
It could be that the object is not being included in lumen GI, only in screen space. Try using Lumen Scene Visualizer, if fully black then thats the issue.
yes, all screen turns black when I use Lumen Scene Visualizer. so, is there any step to solve this problem? Unfortunatelly my graphic card is under version of GTX 1060, thats why I cant use RayTracing with Lumen 
what does it mean ‘‘object is not being included in lumen GI, only in screen space’’
Thanks for your reply.
I tried many times but didn’t work for me idk why
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What I think is the solution to your issue. But before recommending you do the extra work, try recreating the same issue with a blockout of part of your scene, use basic geometry to see if the same happens. In the engine add a basic plane as floor and a cube inside the room to test. Press h on selected actors to hide them, ctrl+h to show all.