Use AirDrop for nearby Apple devices
Upload to iCloud Drive and share the link
Use Messages with iMessage if the video is small enough
Send through Mail Drop in the Mail app
Upload to Google Drive, Dropbox, or OneDrive and share the link
Use WhatsApp, Telegram, or similar apps that support larger files
Trim the video in Photos before sending
Compress the video with a video compressor app
Share from the Files app instead of Photos
Use a USB cable and transfer to a computer first if needed