I'm looking for a good plugin to remove background

If you want to remove a background, the first step is always to prepare the shot and the camera carefully. For example, this shot from Adobe Stock is going to be extremely difficult.

This one is going to be a lot easier. The subject is in focus, the edges are sharp. most of the foreground has significantly different color values than the background.

Rotobrush would be your best option for both edges, but both will require some hand masking and manual Rotoscope (animated masks) to do a really good job. 

When I have to shoot a scene and remove the background I always use a higher shutter speed to reduce or eliminate motion blur. You can put that back in later. Control the lighting as much as possible so that edges don't blend in with the background. Control camera position to keep the color values between the foreground and background as far apart as possible, and eliminate fly away hair as much as possible. 

Show us a frame from the footage you are trying to use and we can give you some specfic instructions. In many cases a procedural matte created from a heavily color corrected copy of the footage can be used to remove a great deal of the background, then a little Rotoscoping or Rotobrush can be used to clean up the rest of the image. Unless the background is fairly uniform, most of the time, even with careful planning, you are going to have to use more than one tool and have more than one layer.

Is that Adobe After Effects your wanting the plugin for?