Discover cameras that are NOT in a view

Get-CamerasThatArentInAView.ps1

function Get-CamerasThatArentInAView {
    [CmdletBinding()]
    param ()
    
    process {
        $camerasInViews = @{}

        $publicViewGroups = Get-VmsViewGroup | Where-Object Name -ne 'Private'
        $views = $publicViewGroups | Get-VmsViewGroup -Recurse | Get-VmsView
        foreach ($view in $views) {
            foreach ($item in $view.ViewItemChildItems) {
                $definition = [xml]$item.ViewItemDefinitionXml
                if ($definition.viewitem.type -notmatch 'CameraViewItem') {
                    continue
                }
                $camerasInViews[$definition.viewitem.iteminfo.cameraid] = $null
            }
        }
        
        Get-VmsCamera | Where-Object { !$camerasInViews.ContainsKey($_.Id) }
    }
}