Magento – Get all gallery images

override the below template for getting gallery images url in product detail page

app/design/frontend/Vendor/ThemeName/Magento_Catalog/templates/product/view/gallery.phtml

<?php /* @escapeNotVerified */ $json=$block->getGalleryImagesJson();
$array = json_decode($json,true);
foreach($array as $item)
{
    $imgurl = $item['full'];
    echo $imgurl;        
}

use this above method I rendered full image. you can able to get full,small,thumbnail images. If you want to know about what are the images type available, just var_dump($json).

I'm not exactly sure what you're trying to do. Do you want to remove a video from the product? Or only not show it?

Here is my code to remove all product images, you can put a condition in there to remove only the video you want:

/** @var \Magento\Catalog\Model\Product $product */

$gallery = $product->getMediaGalleryEntries();
foreach ($gallery as $key => $entry) {
    $image = $entry->getFile();
    if (your condition) {
        $image = 'pub/media/catalog/product' . $image;
        // Remove entry from Media Gallery
        unset($gallery[$key]);
        // Delete file
        unlink($image);
    }
}
// Save changed media gallery to product     
$product->setMediaGalleryEntries($gallery);
// Save Product
$product = $this->productRepository->save($product);

I hope this helps.