Applying HLSL Shaders To Video With Avisynth?

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I have read that avisynth can do the following:

1. Load a video.
2. Apply an HLSL shader to the video frames.
3. Save the video.

This plugin down below is supposed to make this possible:

https://github.com/mysteryx93/AviSynthShader

I have never used avisynth before, so I'm a bit lost.

Can anyone tell me how to do this?

I need an example script that tells Avisynth to:

1. Load video
2. Apply HLSL shader(s)
3. Save result

Also, is there any another software that can apply HLSL shaders to video frames and save the result to a video file?

Thank you all very much!