In order to create better VJ loops, you can integrate Blender with After Effects by using the Adobe After Effects Exporter add-on. In this way, you can easily mix your 3D scene with your favorite AE plug-in. Although I use Particular, you could use any other plug-in, including Mir, Form, TAO or 3D Stroke. To achieve loopable camera animations, the Follow Path constraint is a good option, then you just need to add a bezier circle, deform it, and use it as target object. If you use Particular, it is important to modify the Visibility parameter to remove unwanted particles from your loop.