How to create screen capture video without losing it's quality?
QuickTime is included with macOS. This app has a built in screen capture tool. You can create a new screen recording by pressing Command-N to create a new screen recording after opening QuickTime, then set settings to Maximum Quality by clicking the drop down beside the record button. The video will save after recording to any location on your machine. See more Here on Apple's Webiste.

After this, you can ingest the footage onto your video editor and send it to someone.

Hope this helps.