Currently, it is not possible to change the default app that opens a particular file type, hyperlink etc.
However, many third-party applications allow you to import and / or open images, videos, etc. Directly from the default locations without first having to transfer the files via iTunes or an internet shooting service.
When it comes to VLC, if you don't want to connect iPad to iTunes, then the best option is to enter the Photos app and save videos to files, Dropbox, Google Drive, etc. A saved, go into VLC and get access the sidebar, tap Cloud Services, and then select the appropriate option to access the video.
For example, to access a video recording on VLC you can:
- Go to pictures
- Tap the video
- Touch the Share icon and select Save to files
- Navigate to where in Files you want save the video and continue saving it [1
- Go to the sidebar
- Press Cloud Services
- In the next screen, tap Cloud Services again
- Open the video recording