If you would like to add depth of field effects to your videos on a low budget, take a look at this sample video footage taken with a homebrew depth of field adapter on a Panasonic DVX 100. This was made for about $80 from parts bought from eBay and the hardware store.
Here are the instructions for building this adapter. A video tutorial is supposed to be coming soon. If you have a less expensive camera such as the Panasonic PV-GS300, check this site out for info on building one for that model.