Yes, you can export a portion of a video in Waylens Studio or our Apps.
Take Waylens Studio for example,
First you need to drag your buffered video into the edit area
click on it to generate a new highlight
click on the highlight frame that will be turned into red
click on the expand button above
you will see a new window popped up for you to modify the length of the highlight
you can hover to move the start/stop icon as you like
then click save, you will get the desired length and part of video in the highlight area.
then you can share or export it elsewhere.