How to make video sharp?

I have a Nikon D7000 with a standard 18-105mm lens I bought with the camera. I've tested and tried editing in Photoshop Elements video editor but can't seem to get the sharpness and crispness that I want. I've tried filming with all the settings down and turning up in the editor but I can't seem to get it. I still get that blurness and lack of detail. Is it my lens? Do I need to get a good lens for Clear Crisp video?

It is a little difficult job to use Photoshop, I belive it must can help you make video sharp but it must be very complicated for you to do that. I once tried to learn PS, but I gived up. I'm now suing some easy software to help myself edit videos. If you are interested in it, you can see it here: http://www.dvd-to-flash.com/video-editor-ultimate/
Hope your problem can be solved easily, good luck.

There's a good reason why you have so much difficulty to have a beautiful sharp image, the 18-105 is not what we call very sharp, prime lens or better lens will get you more sharpness. If you try to get the sharpness from a software it will deteriorate your image.

Usually to get the best sharpness out of our lens we have to be a few stop above their initial aperture,

18mm for you, your lens should be the sharpest around f7 if you shoot at 105mm then it should be near f8 - f11

You can try that, if you still think there's not enough sharpness maybe you could rent a prime lens and see the difference, it would be cheaper than buying another lens and find out it's not sharp enough for you.

It is either your lens or you are reducing the resolution in your software but since I don't know PS elements, I can't really say how that might be happening. That camera is exceptional. I have shot music videos, TV spots and short films with the D7000. I know the camera with the right lens, if focused, will give you razor sharp images.

Put the camera on a tripod. Don't think that just because your shooting video the camera hasn't got to be rock steady. Hand held, especially at slower shutter speeds, and with the camera at arms length using the rear screen every frame will be blurry if you don't.

That's why there are so many gizmo's around for holding video camera steady and getting smooth video.

Photoshop Elements is not a video editor.

You mean Adobe Premier Elements.

Have you checked your camera's aperture setting? Wide open apertures will give you shallow depth of field, really high apertures in excess of f/16 may be causing diffraction problems.

Try using sony vegas pro

Optimum light and correct aperture settings.