Note: EpocCam is no longer available for new purchase, and there will be no further updates or development. If you have already purchased the app, it can be redownloaded from Purchase History as long as you are signed into the Apple ID that made the purchase. We're still happy to provide assistance with troubleshooting if needed.
This video about EpocCam offers a quality comparison between your iPhone and a typical Webcam.
If the video doesn't appear in your browser, you can find it here at the Elgato YouTube channel.