Yes, it is. In your newreport.php page you can get the person id using $_GET["personid"] and pass it to your report class like this:

//newreport.php
$personId = $_GET["personid"];
$report = new MyReport(array(
    "personId" => $personId
));

Then in your report php you can access this person id with report params property:

//MyReport.php
...
function setup() {
    $personId = $this->params["personId"];
    ...
}