export large video from phone

I have an Iphone 6s that is 16 GB. I believe the operating system takes up something like 8-9GB itself. I have a very large video that I captured on my phone (1 hour long) that seems to take up all available space on the phone. There is a 5 minute clip that I want out of this video. Here are the things I've tried

1) I am unable to "trim" the video to a desired length to take a relevant part out. It's likely because there isn't enough space to create the clip.

2) Tried to delete every single other application on the phone to make room. This did not help as it wasn't enough. The only thing on this phone that is installed is the default apps and the 1 video.

3) I am also unable to Airdrop the video or send the video to any other device.

Is there anyway I can get the video off of the phone to somewhere that I can trim the relevant clips out?