No. You cannot record 4k videos but you can play 4k videos on Honor 8.
During our tests, Honor 8 achieved AnTuTu score of 92,402 points.
Honor 8 has the wide aperture of f/2.2 for the rear camera and f/2.4 for the front camera.
Yes - absolutely. You are entitled to 90 days screen breakage warranty as well.