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Hello Sir

After 4PDA update to Android 8. I got one issue during making video. Every time I making video it show me an error after 3 minutes that Video will be stopped after 30 second due Camera overheating. Please Check the issue

Please perform a factory reset after the update, following this tutorial:
http://bbs.blackview.hk/viewtopic.php?f=192&t=334922

I already apply the Factory Reset but it persists. 

Ok, that means your phone is having an hardware issue.
You can try to contact your seller to have your phone repaired under warranty or.....
...you can try to replace the main camera by yourself.

Here you can find a spare camera module:
https://it.aliexpress.com/item/32997677942.html?spm=a2g0o.productlist.0.0.105847fbRjs9DX&algo_pvid=512808ca-bc77-4836-8ac2-06194cbab504&algo_expid=512808ca-bc77-4836-8ac2-06194cbab504-4&btsid=ffb16754-215d-4b3a-af49-0f43096f3800&ws_ab_test=searchweb0_0%2Csearchweb201602_10%2Csearchweb201603_53