Pro tip: try Marco Polo. It's free. That's not to say yours isn't a good idea, and probably worth money if more specifically implemented for remote teams.

Disclosure: I work on this app, but the standup use case is an "off-label" use that we ourselves employ internally. The app itself is for friends/family to basically video text/walkie-talkie but it serves a use as asynchronous video communication for other purposes.