As noted by iOS developer Daniel Niyazov, Apple could add
pause and resume feature while recording video in iOS 11 on iPhone and iPad.
He tweeted a screenshot showing some codes that mention the
Pause and Resume function in the camera framework. So it’s unclear if Apple
adds this feature in the coming version or might be a new feature for upcoming
iPhone 8 camera.
Apple could add pause and resume feature while recording video in iOS 11 on iPhone and iPad.
Daniel Niyazov tweeted;
Apple previously lacks pause and resuming video while
shooting on 10 or below and still lacks in iOS 11 beta 5. So according to
Daniel Niyazov, Apple may add this this feature in the final version of iOS 11
or in upcoming beta version.

Shall we see pause/resume feature in next iOS 11 version
while recording a video?

If you are on jailbroken state, you can always download the cydiatweak called RecordPause which lets you pause and resume video while shooting
videos on iPhone/iPad.