Pimcore\Model\Document\Tag\Video::resolveDependencies PHP Method

    public function resolveDependencies()
    {
        $dependencies = [];
        if ($this->type == "asset") {
            $asset = Asset::getById($this->id);
            if ($asset instanceof Asset) {
                $key = "asset_" . $asset->getId();
                $dependencies[$key] = ["id" => $asset->getId(), "type" => "asset"];
            }
        }
        if ($poster = Asset::getById($this->poster)) {
            $key = "asset_" . $poster->getId();
            $dependencies[$key] = ["id" => $poster->getId(), "type" => "asset"];
        }
        return $dependencies;
    }