Start Screen Recording.scpt

set theProcessName to "iOS Simulator"
set theWindowNumber to 1

tell application "System Events"
    tell process theProcessName
        activate
        tell window theWindowNumber
            set thePosition to position
            set theSize to size
        end tell
    end tell
end tell

tell application "QuickTime Player"
    activate
    new screen recording
    delay 1
    tell application "System Events" to key code 49
    delay 1
    do shell script "~/bin/clickdrag -x " & (item 1 of thePosition) & " -y " & (item 2 of thePosition) & " -dx " & (item 1 of theSize) & " -dy " & (item 2 of theSize)
end tell

Thanks for this @pwc3

I've made two changes to get this working for me today (April 2018):

1. Change "iOS Simulator" to "Simulator". (Of course, you can still select any app of your choosing.)
2. Append .swift to the clickdrag filename: ~/bin/clickdrag.swift.

Here's my Start Screen Recording.scpt file:

set theProcessName to "Simulator"
set theWindowNumber to 1

tell application "System Events"
	tell process theProcessName
		activate
		tell window theWindowNumber
			set thePosition to position
			set theSize to size
		end tell
	end tell
end tell

tell application "QuickTime Player"
	activate
	new screen recording
	delay 1
	tell application "System Events" to key code 49
	delay 1
	do shell script "~/bin/clickdrag.swift -x " & (item 1 of thePosition) & " -y " & (item 2 of thePosition) & " -dx " & (item 1 of theSize) & " -dy " & (item 2 of theSize)
end tell