You can use countdown timer function, But you need to enable the floating button you use the countdown timer, Countdown timer helps to start recording up to 10 seconds later after you clicked the recording button

 Step 1  -Go the setting of the app

Step -2 Go in Recording options and tap on countdown timer option 

step 3 - Now you will see various options ( No countdown , 3s, 5s, 10s,) choose the one which you desire and click ok 

Now before the recording starts you will be able to see the countdown on your screen for example if you have selected 3s then the Countdown will be 3 seconds .