Hard to fix remotely since I for one can't reproduce this on my matching system.
So as a sanity check...
- you downloaded Sierra from where and how?
Using download Sierra tool from
@dosdude1
- did you upgrade or install on a clean partition?
Upgrade
- if in place, what was your previous OS and was iSight working fine then?
El Cap 10.11.6
- you post-installed with
@dosdude1's force rebuild and it fixed keyboard and trackpad?
At the first time, I don't selected that option, but when in the log screen I realize that keyboard an trackpad were not working, boot it again, go to Post Install and this time selected "force ..". After this, keyboard and trackpad were working perfectly
- did you replace any kexts yourself?
Yes, tried the El Cap AppleUSBVideoSupport.kext from
@dosdude1
- you ran a disk utility repair/system check?
No
- you reset SMC? if so how? (there are different procedures per system)
No
- you reset PRAM? if so how?
Yes, following this steps
- Shut down your Mac.
- Command (⌘), Option, P, and R.
- Turn on your Mac.
- Press and hold Command-Option-P-R keys immediately after hear the startup sound.
- Hold keys until the computer restarts and hear the startup sound for a second time
- Release the keys.
- are all your other devices working properly wifi, bluetooth, display?
Yes
- are all your ports working properly ? especially USB.
All working nicely
- do you have a working Sierra recovery partition?
No
- have you rebooted into macOS Safe Mode?
No
- have you rebooted into macOS single user Mode? if so did you spot any errors?
No
- do you a have working El Capitan partition or on an external device you can reboot your system with?
No (I have a iMAC mid 2011 with Mac OS Sierra installed)
You may have already answered these, but a checklist always helps...