Add image in media element in typo3

TYPO3 Questions
1

I am stuck with a problem. I added a video using typo3 TCA media. Now i want to add thumbnail image to the video. I extended sys_file_reference, added image inside that video. I do not know how to render it, following is my typoscript

    dataProcessing.1676624357 = TYPO3\CMS\Frontend\DataProcessing\FilesProcessor
dataProcessing.1676624357 {
    if.isTrue.field = media
    references.fieldName = media
    references.table = tt_content
    sorting = sorting_foreign
    as = media

    dataProcessing {
        115511551155 = TYPO3\CMS\Frontend\DataProcessing\FilesProcessor
        115511551155 {
            references.fieldName = thumbnail_image
        }
    }
}