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Showing content from https://docs.unity3d.com/Manual/sprite/../class-CustomRenderTexture-write-shader.html below:

Manual: Write a shader for a Custom Render Texture

Create a Custom Render Texture

Control when a Custom Render Texture updates

To update a Custom Render TextureA special type of Texture that is created and updated at runtime. To use them, first create a new Render Texture and designate one of your Cameras to render into it. Then you can use the Render Texture in a Material just like a regular Texture. More info
See in Glossary manually, you can write a specialized Custom Render Texture shaderA program that runs on the GPU. More info
See in Glossary.

To help you write your Custom Render Texture shaders, here are two example frameworks that contain utility functions and built-in helper variables.

The following shader example fills the texture with a color multiplied by a color. When you write a shader for a Custom Render Texture, you must do the following:

• #include "UnityCustomRenderTexture.cginc".
• Use the provided Vertex ShaderA program that runs on each vertex of a 3D model when the model is being rendered. More info
  See in Glossary CustomRenderTextureVertexShader.
• Use the provided input structure v2f_customrendertexture for the pixelThe smallest unit in a computer image. Pixel size depends on your screen resolution. Pixel lighting is calculated at every screen pixel. More info
  See in Glossary shader.

Shader "CustomRenderTexture/Simple"
{
    Properties
    {
        _Color ("Color", Color) = (1,1,1,1)
        _Tex("InputTex", 2D) = "white" {}
     }

     SubShader
     {
        Lighting Off
        Blend One Zero

        Pass
        {
            HLSLPROGRAM
            #include "UnityCustomRenderTexture.cginc"
            #pragma vertex CustomRenderTextureVertexShader
            #pragma fragment frag
            #pragma target 3.0

            float4      _Color;
            sampler2D   _Tex;

            float4 frag(v2f_customrendertexture IN) : COLOR
            {
                return _Color * tex2D(_Tex, IN.localTexcoord.xy);
            }
            ENDHLSL
            }
    }
}

The following example is a shader for a material you can use to initialize a Custom Render Texture. When you write a shader for an initialization Material, the following steps are mandatory:

• #include "UnityCustomRenderTexture.cginc"

• Use the provided Vertex Shader CustomRenderTextureVertexShader

• Use the provided input structure v2f_customrendertexture for the pixel shader.

Shader "CustomRenderTexture/CustomTextureInit"
{
    Properties
    {
        _Color ("Color", Color) = (1,1,1,1)
        _Tex("InputTex", 2D) = "white" {}
    }

    SubShader
    {
        Lighting Off
        Blend One Zero

        Pass
        {
            HLSLPROGRAM
            #include "UnityCustomRenderTexture.cginc"

            #pragma vertex InitCustomRenderTextureVertexShader
            #pragma fragment frag
            #pragma target 3.0

            float4      _Color;
            sampler2D   _Tex;

            float4 frag(v2f_init_customrendertexture IN) : COLOR
            {
                return _Color * tex2D(_Tex, IN.texcoord.xy);
            }
            ENDHLSL
        }
    }
}

Create a Custom Render Texture

Control when a Custom Render Texture updates

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