These are usually saved directly to your Photos app if "Save to Camera Roll" was enabled.
If the video was deleted, it can only be recovered if you have a WhatsApp Google Drive/iCloud backup from a date shortly after you received it.
Check your file manager under Internal Storage > Android > media > com.whatsapp > WhatsApp > Media > WhatsApp Video .
If the video won't play, try opening it with VLC Media Player , which can often bypass minor file errors that standard players can't.
Since the filename contains "20220326," you can search your gallery or file explorer for media created on March 26, 2022 . Troubleshooting the File