Sony SLT-A58K vs Nikon d3100? Which DSLR for video?

My primary use for it is Youtube videos. It needs to be good at shooting with a nice blurred background. Image quality isn't all that important as I won't be using it that much. Which camera is better for Video?

The Sony is, no contest.

As for your "blurred background", you are going to be terribly disappointed with either if you don't already know how to get that "blurred background" that you want. The camera body has little to do with it… It's in the lens and how you use it.