Video Field for Recording on DESKTOP

For example I want to record a video WHILE I fill out a form and then store that video into the form (and thus the connected record). Currently on desktop I cannot record video, however accessing my app on mobile using the "file" field it provides an option to record video, but then I cannot access the form at the same time! So it would mean record video then fill out the form (or vice versa) but I would like to do both simultaneously.

Either way, it would be nice to record using a webcam even on a seperate app, but currently Knack only supports camera usage on mobile.