canRecordScreen.swift

// From https://stackoverflow.com/a/58985069/118631

@available(macOS 10.15, *)
func canRecordScreen() -> Bool {
	let runningApplication = NSRunningApplication.current
	let processIdentifier = runningApplication.processIdentifier

	guard let windows = CGWindowListCopyWindowInfo([.optionOnScreenOnly], kCGNullWindowID)
		as? [[String: AnyObject]] else
	{
		assertionFailure("Invalid window info")
		return false
	}

	for window in windows {
		// Get information for each window
		guard let windowProcessIdentifier = (window[String(kCGWindowOwnerPID)] as? Int).flatMap(pid_t.init) else {
			assertionFailure("Invalid window info")
			continue
		}

		// Don't check windows owned by this process
		if windowProcessIdentifier == processIdentifier {
			continue
		}

		// Get process information for each window
		guard let windowRunningApplication = NSRunningApplication(processIdentifier: windowProcessIdentifier) else {
			// Ignore processes we don't have access to, such as WindowServer, which manages the windows named
			// "Menubar" and "Backstop Menubar"
			continue
		}

		if window[String(kCGWindowName)] as? String != nil {
			if windowRunningApplication.executableURL?.lastPathComponent == "Dock" {
				// Ignore the Dock, which provides the desktop picture
				continue
			} else {
				return true
			}
		}
	}

	return false
}

Working for me

static func permissionCheck() -> Bool {
  if #available(macOS 10.15, *) {
    let runningApplication = NSRunningApplication.current
    let processIdentifier = runningApplication.processIdentifier
    guard
      let windows = CGWindowListCopyWindowInfo([.optionOnScreenOnly], kCGNullWindowID)
        as? [[String: AnyObject]],
      let _ = windows.first(where: { window -> Bool in
        guard
          let windowProcessIdentifier = (window[kCGWindowOwnerPID as String] as? Int).flatMap(
            pid_t.init),
          windowProcessIdentifier != processIdentifier,
          let windowRunningApplication = NSRunningApplication(
            processIdentifier: windowProcessIdentifier),
          windowRunningApplication.executableURL?.lastPathComponent != "Dock",
          let _ = window[String(kCGWindowName)] as? String
        else {
          return false
        }

        return true
      })
    else {
      return false
    }
  }
  return true
}