How to perform alpha blending on saved raw argb videos(a image and a video will also work) using direct3d9 , direct3d10 or direct3d11?

Question

I'm trying to perform alpha blending on videos using direct3d11. I've wrote the code snippet below to achieve this. I've tried to read the video file out2.argb frame by frame and store it in the rawData. Later, I passed that rawData to CreateTexture2D but pTexture remained null after the execution of the API. So I tried passing NULL to the CreateTexture2D and passing rawData to the UpdateSubresource but again the pTexture remained NULL. DirectX 11 ID3DDevice::CreateTexture2D with initial data fail I've referred the question and answers here to make this work but the APIs are returning failure.

HRESULT result;
    FILE * fp = NULL;
    int size = 1280 * 720 * 4 ;
    void * rawData = NULL;
    D3D11_TEXTURE2D_DESC desc;
    desc.Width = 1280;
    desc.Height = 720;
    desc.MipLevels = 0;
    desc.ArraySize = 1;
    desc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
    desc.SampleDesc.Count = 1;
    desc.Usage = D3D11_USAGE_DYNAMIC;
    desc.BindFlags = D3D11_BIND_SHADER_RESOURCE| D3D11_BIND_RENDER_TARGET;
    desc.CPUAccessFlags = 0;
    desc.MiscFlags = D3D11_RESOURCE_MISC_GENERATE_MIPS;


    D3D11_SHADER_RESOURCE_VIEW_DESC shader;
    shader.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
    shader.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;
    shader.Texture2D.MipLevels = -1 ;
    shader.Texture2D.MostDetailedMip = 0;


    fp = fopen("../Engine/Data/out2.argb", "rb");
    rawData = malloc(size);

    D3D11_SUBRESOURCE_DATA data;
    data.SysMemPitch = 1280 * 4;
    data.SysMemSlicePitch = 1280 * 720 * 4;


    if (NULL == rawData)
        return -1;
    int row_pitch = (1280 * 4) * sizeof(unsigned char);
    if (fp)
    {
        /*while (!feof(fp))
        {*/
            fread(rawData, size,1, fp);
            //D3D11_SUBRESOURCE_DATA *sSubData = new D3D11_SUBRESOURCE_DATA[1];
            //for (int i = 0; i < 1; i++) {
            //  sSubData[i].pSysMem = rawData;
            //  sSubData[i].SysMemPitch = (UINT)(1280 * 4);
            //  sSubData[i].SysMemSlicePitch = /*(UINT)(1280 * 720 * 4)*/0;
            //}

            //data.pSysMem = rawData;
            // GOT FRAME
            device->CreateTexture2D(&desc, NULL, &pTexture);
            deviceContext->UpdateSubresource(pTexture, 0, NULL, rawData, row_pitch , 0);
            result = device->CreateShaderResourceView(pTexture, &shader, &m_texture);
            if (FAILED(result))
            {
                return false;
            }


    /*  }*/

        fclose(fp);
        fp = NULL;
        free(rawData);
        return true;