Video from your mobile device.
When God starts stacking eyeballs vertically on the majority of humans, I'll change my opinion on vertical video.
Please, don't do it. Give us those nice HD videos! Apps you might be interested in for videos will be listed below.
There are a TON of apps out there, more than I could possibly list, and if you have one you love, please send me a message about why you like it and what it does.
VidTrim Pro - Video Editor - https://play.google.com/store/apps/details?id=com.goseet.VidTrimPro&hl=en "VidTrim Pro is a video editor and organiser for Android. It includes multiple features like trimming, merging, frame grabbing, video effects, extract audio (convert to MP3) and transcoding (compress and convert to MP4). You can also share your videos with your friends directly through the app."