Greenfall has a pretty high level of camera shake / head bob when you play, especially during combat. Some players have reported getting motion sickness from playing the game, and unfortunately there is no option to turn off this camera shake in the game. However, it's still possible to get rid of it, but you will need to download a modification for it.
The best mod for turning off the camera shake in Greedfall is Camera Overhaul, and can be downloaded from: https://www.nexusmods.com/greedfall/mods/8.
In addition to removing the camera shake it does improve the camera in a few other ways, so it's a great mod to download and install if you want to play Greedfall.
You install the mod by downloading it from Nexus, then unzipping it. Now move the folder called "camera" into your Greedfall install directory. Restart the game, and it's good to go!
This will hopefully get rid of the motion sickness that a lot of people have experienced, but it might also be useful for people who just find the camera shake to be very annoying.