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Does exactly what you're asking for... seems very reliable so far... 3 months in and has an app you can view front and rear cameras... and recorded footage on your iPhone...
Yes we have three, the instructions are long gone in the bin so i can't tell you what their fps but if its not 24 then it's very close. Its a budget cam and not the most discreet but it does the job.
A lot (most?) just keep recording over the memory card, so you probably want to use a small enough one that doesn't record all your shit driving, but is enough to record an incident someone else caused. They stop recording immediately if you're in a crash, or you press the button.