While difficult to do, you could video record with the front camera. That is not HD. Which iPhone are you using? I believe there may be a couple of apps in the App store. You would need to do a search and decide if any meet your needs.
Sorry, I missed the iPhone 5 in your profile. The only way to know what the apps do without purchase is to read the reviews, or if someone else provides you some feedback here in your post. I do not use any so I couldn't help you any further.