MacOS – Screen Recording – NO COMPRESSION

1. record as usual
2. when ready to pause, move your mouse over to the recording box and click anywhere to activate that box (the Quicktime Program)
3. press "option button" on keyboard and the record bar will change to Pause ||
4. BUT, this DOES NOT PAUSE the timer, to do that,click the Pause ||
5. Now, it's truly PAUSED and you can let go of the "option" button
6. Now, the record button turns RED, when in this mode, it's PAUSED
7. To restart recording, simply click the RED button
8. Do steps 2 to 7 all over again for another pause in your recording

Starting from iOS8 and Yosemite You can capture the screen of iOS device from Quicktime directly. Here's the steps:

1. Connect your iPhone, iPad or iPod touch to your Mac via a Lightning Cable.
2. Open the QuickTime app.
3. Go to File and select ‘New Movie Recording’.
4. A recording window will appear. You will a see little arrow for drop down menu in front of the record button. Click that arrow and select your iPhone.
5. Select the Mic of your iPhone if you want to record music, app/game sounds.
6. Click the Record button. Now perform the tasks on your iOS device that you want to record.
7. Once done tap the stop button and save the video.
8. Done!

All steps taken from: ioshacker website. Enter there for screenshots.