Yes,now it is very easy to use your mobile as webcam via Bluetooth,

Just Download and try it. it is tested  and 100% working.

for that you must have to install this application to your PC and Mobile also.
 FASTCODE MOBILE HUB V1.1    Download
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This application requires Microsoft .NET Framework 2.0 redistributable to be installed on your system.
You can download it free from www.microsoft.com or
from www.javanokia.com/redist/dotnetfx.exe