Model for form-filter
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class Filterdemand extends \TYPO3\CMS\Extbase\DomainObject\AbstractDomainObject {

    /**
     * Sys-testings set within filter-form
     * @var \TYPO3\CMS\Extbase\Persistence\ObjectStorage<\Vendor\Medialibrary\Domain\Model\Test>
     */
    protected $testings;

    /**
    * __construct
    *
    * @return AbstractObject
    */
    public function __construct() {
        $this->testings = new \TYPO3\CMS\Extbase\Persistence\ObjectStorage();
    }


    /**
     * Returns the testings
     *
     * @return \TYPO3\CMS\Extbase\Persistence\ObjectStorage<\Vendor\Medialibrary\Domain\Model\Test> $testings
     */
    public function getTestings() {
        return $this->testings;
    }

    /**
     * Sets the testings
     *
     * @param $testings testings
     * @return void
     */
    public function setTestings($testings) {
        $this->testings = $testings;
    }

}



Model of records parsed through ForViewHelper
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class Test extends \TYPO3\CMS\Extbase\DomainObject\AbstractEntity {

    /**
     * Title of entry
     *
     * @var string
     */
    protected $title;

    /**
     * Returns the title
     *
     * @return string $title
     */
    public function getTitle() {
        return $this->title;
    }

    /**
     * Sets the title
     *
     * @param string $title
     * @return void
     */
    public function setTitle($title) {
        $this->title = $title;
    }

}

Controller (for different records than the ones parsed through ForViewHelper)
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class AsdfController extends \TYPO3\CMS\Extbase\Mvc\Controller\ActionController {

    /**
     * testRepository
     *
     * @var \Vendor\Medialibrary\Domain\Repository\TestRepository
     * @inject
     */
    protected $testRepository;

    /**
     * @var \TYPO3\CMS\Extbase\Object\ObjectManagerInterface
     * @inject
     */
    protected $objectManager;



    /**
     * action list
     *
     * @param Vendor\Medialibrary\Domain\Model\Filter $filter Filter set within form
     * @return void
     */
    public function listAction(\Vendor\Medialibrary\Domain\Model\Filterdemand $filterdemand = NULL) {

        $testings = $this->testRepository->findAll();

        $filterdemand = $this->objectManager->get('Vendor\\Medialibrary\\Domain\\Model\\Filterdemand');
        $filterdemand->setTestings($testings);


        $this->view->assignMultiple(array(
            'testings' => $testings,
            'filterdemand' => $filterdemand,
        ));

    }

}


View
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        <f:form action="list" name="filter" object="{filterdemand}">
            <fieldset>
                <f:for each="{testings}" as="test">
                    <f:form.checkbox value="{test.uid}" property="testings" id="testings{test.uid}" /><label for="testings{test.uid}">{test.title}</label><br />
                </f:for>
            </fieldset>
            <fieldset>
                <f:form.submit value="Filtern" />
            </fieldset>
        </f:form>