ZipaClip is an interesting approach to privacy for videos that you don't want to share through social media services.
The free app encrypts video and sends it to a secure server. If the recipient has the app, they can download it from the cloud. It's good for family sharing or when you need security in a business environment. You can also use the app to send private text messages.
Free is good, but there is some fine print. If you want to send clips longer than 30 seconds, you have to buy additional time. It ranges from 20 minutes of storage (US$0.99) to 120 minutes ($5.99). The free version allows you to send unlimited 30-second clips until you exceed 30 minutes of storage.
One clever feature is called ZipBack. If you sent something by mistake, it can be recalled, but if the person has viewed the item that's not that helpful. It does give you control over what you send. I wish I had that for all the emails I didn't mean to send over the years.
The downside is that only way to see the sent videos is from an iOS device. If people try to link to the video from regular email, it won't work. I kind of find that a negative, but I understand that regular mail is a security issue, and keeping everything in-app keeps it secure. Of course, I don't see why there can't be an OS X version of the app, or a Windows version.
If you're looking for secure cloud-based text and video exchanges, ZipaClip will probably fill the bill. If you can live with the requirements to keep it free, all the better. If not, there are some paid options.
ZipaClip is a universal app that requires iOS 5 or greater.