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Showing content from https://docs.unity3d.com/Manual/urp/urp-shaders/../use-built-in-shader-methods-camera.html below:

Manual: Use the camera in a custom URP shader

Transform positions in a custom URP shader

Use lighting in a custom URP shader

Use the camera in a custom URP shader

To use the cameraA component which creates an image of a particular viewpoint in your scene. The output is either drawn to the screen or captured as a texture. More info See in Glossary in a custom Universal Render PipelineA series of operations that take the contents of a Scene, and displays them on a screen. Unity lets you choose from pre-built render pipelines, or write your own. More info See in Glossary (URP) shaderA program that runs on the GPU. More info See in Glossary, follow these steps:

Add #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl" inside the HLSLPROGRAM in your shader file. The Core.hlsl file imports the ShaderVariablesFunction.hlsl file.
Use one of the following methods from the ShaderVariablesFunction.hlsl file.

Method Syntax Description GetCameraPositionWS float3 GetCameraPositionWS() Returns the world space position of the camera. GetScaledScreenParams float4 GetScaledScreenParams() Returns the width and height of the screen in pixelsThe 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. GetViewForwardDir float3 GetViewForwardDir() Returns the forward direction of the view in world space. IsPerspectiveProjection bool IsPerspectiveProjection() Returns true if the camera projection is set to perspective. LinearDepthToEyeDepth half LinearDepthToEyeDepth(half linearDepth) Converts a linear depth bufferA memory store that holds the z-value depth of each pixel in an image, where the z-value is the depth for each rendered pixel from the projection plane. More info See in Glossary value to view depth. Refer to Cameras and depth textures for more information. TransformScreenUV void TransformScreenUV(inout float2 screenSpaceUV) Flips the y coordinate of the screen space position, if Unity uses an upside-down coordinate space. You can also input both a uv, and the screen height as a float, so the method outputs the position scaled to the screen size in pixels. Example

The following URP shader draws object surfaces with colors that represent the direction from the surface to the camera.

Shader "Custom/DirectionToCamera"
{
    SubShader
    {
        Tags { "RenderType" = "Opaque" "RenderPipeline" = "UniversalPipeline" }

        Pass
        {
            HLSLPROGRAM

            #pragma vertex vert
            #pragma fragment frag

            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"

            struct Attributes
            {
                float4 positionOS : POSITION;
                float2 uv: TEXCOORD0;
            };

            struct Varyings
            {
                float4 positionCS  : SV_POSITION;
                float2 uv: TEXCOORD0;
                float3 viewDirection : TEXCOORD2;
            };

            Varyings vert(Attributes IN)
            {
                Varyings OUT;

                // Get the positions of the vertex in different coordinate spaces
                VertexPositionInputs positions = GetVertexPositionInputs(IN.positionOS);
                OUT.positionCS = positions.positionCS;

                // Get the direction from the vertex to the camera, in world space
                OUT.viewDirection = GetCameraPositionWS() - positions.positionWS.xyz;

                return OUT;
            }

            half4 frag(Varyings IN) : SV_Target
            {
                // Set the fragment color to the direction vector
                return float4(IN.viewDirection, 1);
            }
            ENDHLSL
        }
    }
}

Additional resources

Transform positions in a custom URP shader

Use lighting in a custom URP shader

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