Vertex shader not rendering anything

I would like to start this off by saying this is my first time doing anything with shaders. What im trying to do is move the vertices of a mesh to the positions I have saved in a texture. The texture holds the RGB value of the vertex positions of a animation frame (so each line in the texture is a new frame, each pixel in the line holds a vertex position), i am only trying to render the first line/frame at the moment

Code (CSharp):

1. Shader "Unlit/VertShader"
2. {
3.    
4.     Properties
5.     {
6.         [NoScaleOffset] _MainTex("Texture", 2D) = "white" {}
7.         _AnimVertexTex("Texture", 2D) = "white" {}
8.     }
9.     SubShader
10.     {
11.  
12.         Pass
13.         {
14.             CGPROGRAM
15.             #pragma vertex vert
16.             #pragma fragment frag
17.             #pragma target 3.5
18.  
19.             struct appdata
20.             {
21.                 uint vertexId : SV_VertexID;
22.                 float4 vertex : Position;
23.                 float2 uv : TEXCOORD0;
24.             };
25.  
26.             struct v2f
27.             {
28.                 float4 vertex : SV_POSITION;
29.                 float2 uv : TEXCOORD0;
30.             };
31.  
32.             sampler2D _AnimVertexTex;
33.             sampler2D _MainTex;
34.  
35.             v2f vert (appdata v)
36.             {
37.                 float vertCoords = v.vertexId;
38.                 float animCoords = 0;
39.                 float4 texCoords = float4(vertCoords, animCoords, 0, 0);
40.                 float4 position = tex2Dlod(_AnimVertexTex, texCoords);
41.  
42.                 v2f o;
43.                
44.                 // Use position values as a standard local space coordinates
45.                 o.vertex = UnityObjectToClipPos(position);
46.                 return o;
47.             }
48.  
49.             fixed4 frag(v2f i) : SV_Target
50.             {
51.                 fixed4 col = tex2D(_MainTex, i.uv);
52.                 return col;
53.             }
54.  
55.            
56.             ENDCG
57.         }
58.     }
59. }

This is the Shader I have at the moment, I think the problem has something to do with this part but like i said this is the first time I have touched shaders so I really have no idea

Code (CSharp):

1.  
2.                 float vertCoords = v.vertexId;
3.                 float animCoords = 0;
4.                 float4 texCoords = float4(vertCoords, animCoords, 0, 0);
5.                 float4 position = tex2Dlod(_AnimVertexTex, texCoords);
6.  

Any help would be greatly appreciated