Issue with Camera speed and sensitivity

Have you tried a different mouse ? Could you check your Windows settings and maybe play around with the sensitivity settings ?

I can't really test this or watch your video as it sounds like something that would trigger my motion sickness.

I'll ask around if others can test this.

As said I'm unable to test this as I get motion sick.

Could you try renaming your user folder. I doubt there's any settings that can affect this but you never know.

Renaming will reset everything, including your saves but they are still in folder with the name. Test a new save and if it works, start putting your files back from the renamed folder.

In detail: 

Try resetting your user files as described in the factory reset described in this post: http://answers.ea.com/t5/The-Sims-4/FAQ-Troubleshooting-Steps-amp-Known-Issues/m-p/3621199

You won't loose anything. Just make sure to not delete any files  and make a backup.

After renaming, repair your game by right clicking on the game in Origin.

Try on a new game with nothing added back first (start new game). If it works, put back your save game and try again. If it still works, you can start putting stuff back.

• Options.ini (or just re-set all your settings manually)
• Tray Folder
• Screenshots/Videos/Custom music
• Rest of the save games (leave out slot_00000001.save which is the autosave)
• Custom content like clothing, hair, skins, make up ....
• Mods (one by one, making sure they all still work)

The rest does not need putting back, cause they are mostly cache files that recreate or log files that are not needed for the game.

After deleting all .ini files, this has fixed my problem.

Elaboration on this, I specifically deleted the VideoCameraStates .ini file and it started working perfectly

Will removing that file mess up your saves?