This is just going to be more trouble than it's worth. Do you have any kind of budget that you'd be willing to spend on gear for recording? We might be able to make some suggestions based on that.
@BK: While not not having the same options with interchangeable nor OPTICAL zoom lenses (such as with prosumer camera like the Canon GL-2, and all the products in their line since that camera came out circa 2002), the iOS devices that the OP has, potentially cost $1000 USD or more, so to buy alternate video equipment would seem redundant to me, UNLESS you plan to get paid for using it, and never mind the fact that you are locked to whatever firmware is in the dedicated video gear one might buy, and with iOS and Android, there are HUNDREDS of different types of camera apps alone, some with very different kinds of functions, and typically priced $1-$10, and that is the part of the appeal of using these apps, and with the equipment already in hand.
This is rather interesting. I've used two Canon HD video cameras to get wide and close shots at the same time, and 2 mics, a lavaliere on me and a wired on my amp, but for quick one angle videos, it has it's merits.
That's great Mike, but keep in mind, for a person new to taking videos, it's lots of equipment to set up, learn how to connect and wire, learn how to set the controls properly, and not something that everyone can just leave set up ready to go, nor something most folks want to stow in cases in the closet, and spend 20-30 mins to setup before making what might only be a 2 minute video, and then have the pleasure (torture) of having to break it all down and pack it away afterward, so not you've got at least 30-40 min investment for a 2 minute video. To
*me* that all is a royal PITA.
If you look at the weekly Seasons contests here on UU (running now for like 3 or 4 yrs now), I'd wager that 90% of these videos are recorded on a smartphone or tablet, PRIMARILY due to the convenience and ease of use, even if the audio or video quality is not at a professional level, but it's just fine for YouTube, which mangles both audio and video anyway with their horrible implementations of both h.264/MP4 compression and VP8/webm compression.
Besides all the above, in the analog realm (of the bad-old-days) you'd need miles of cables and all kinds of converters, 'switchers'. monitors, etc to have a proper setup, and now, using 2 or more devices linked up via WiFi or Bluetooth, there are NO cables and everything can be controlled or done via software.
You can even download your recordings from your iPad to your computer over WiFi, all WITHOUT any cables at all.
Also, many of our phone and tablet devices today have the ability to record at full 1080p HD (some devices even higher) through Carl Zeiss or similar quality optical elements, or even take still HDR photos in 5, 10 or even 20 megapixel resolutions, so to make an additional investment in other equipment may just be duplicating the hardware functionality that MANY of us already have, and spending money redundantly when it's really not necessary.
Starting after college, I shot, edited and produced commercial video professionally while working for an NYC studio for 15 yrs (as a second income) and the worst part of it all was the tons of equipment required (and at great cost) to create 'broadcast quality' video. Not something I'd want to do again unless all my gear could fit in a single Pelican case on wheels, but now we have an embarrassment of riches with much better options.