I use my phone for my business and am in various business bank account apps as well as scanning confidential business documents with my phone. Am I in any way at risk of a hacker taking over control of my cameras or having access to them and seeing what they see or seeing my screen? On all the official IPhone support pages it seems impossible if not using a jailbroken phone. If it is actually possible, how can I protect my phone?
Apple is continuously patching security problems in all of their OSs with periodic Security updates. In theory if someone exploit one of those security problems in one of your devices before Apple patch it they could gain access to your device and/or data.
That being said, if you are not of specific interest for hackers and you update your devices with all the Security updates when they are released probably you will be fine.