Fake 3D effect with depth map (Unity Shader)

DepthFX.cs

using UnityEngine;

// https://gist.github.com/bozzin/5895d97130e148e66b88ff4c92535b59

public class DepthFX : MonoBehaviour
{
    public float power = -0.02f;

    void Update()
    {
        var mpos = Input.mousePosition;
        mpos.x = (mpos.x / Screen.width * 2 - 1) * -power;
        mpos.y = (mpos.y / Screen.height * 2 - 1) * -power;
        Shader.SetGlobalVector("_MousePos", new Vector4(mpos.x, mpos.y, 0, 0));
    }
}

DepthFX.shader

// https://gist.github.com/bozzin/5895d97130e148e66b88ff4c92535b59

// requires DepthFX.cs script to send mouseposition

Shader "Unlit/DepthFX"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _DepthTex ("Depth Texture", 2D) = "white" {}
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 100

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag

            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

            struct v2f
            {
                float2 uv : TEXCOORD0;
                float4 vertex : SV_POSITION;
            };

            sampler2D _MainTex;
            sampler2D _DepthTex;
            float4 _MainTex_ST;

            float4 _MousePos;

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = TRANSFORM_TEX(v.uv, _MainTex);
                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                float parallaxMult = tex2D(_DepthTex, i.uv);
                float2 parallax = _MousePos.xy*parallaxMult;
                fixed4 c = tex2D(_MainTex, i.uv+ parallax);

                return c;
            }
            ENDCG
        }
    }
}