Hello all - after a bit of research related to the specifics of your task, I have found software that can access any local computer system it is installed on and relay the output of any activity that computer may be involved in.
From there - I can build you a simple web portal to access this software online - I believe this is the type of solution you are looking for.
A few questions to consider before responding to me (or any other proposal for that matter) would be:
1) Do you intend to leave a computer running 24/7 to access and control the cameras?
2) Is having general web browser access to these an acceptable term of operation? If not, then you need outright proprietary software on your phone? (if this is the case I would gladly write a new proposal to develop a native iOS application - but this is a somewhat extreme and expensive route)
3) Finally, do you need the ability for others to access this camera system (again, if you are considering end to end proprietary software, anyone who should be able to access the system will need to download and install such software)
So all that being said - if a (secure) web portal running on server - at an obfuscated domain of course - sounds like what you are looking for - I would be happy to put that together for you...
If you have any other questions - feel free to contact me, I'd rather steer you in the right direction if I can whether your interested in my services or not :)
Thank you - MJHd