Freeze frame then go live

Simply place the playhead at the frame you want to freeze. Then right-click the clip and select "Insert Frame Hold Segment". You might lock other tracks if you don't want clips to be moved by 2 seconds. 

More elegant way is to use Timeremapping.

https://helpx.adobe.com/premiere-pro/using/duration-speed.html

1. You could click the camera icon on the first frame and create a still. Import it into the project panel and then place it into your timeline. (Easiest)