USE INTEL QUICK SYNC FROM INTEGRATED GFX WHILE USING DISCREET AMD/NVIDIA GFX CARD
Enable Intel graphics card in BIOS
Check your PC BIOS User Manual or instructions to see how to enable Intel integrated graphics (iGPU). Enable Intel graphics and save BIOS changes.
Click with mouse right button on the desktop to show menu and select Screen Resolution.
Click Detect button to detect inactive video outputs.
Select detected display output for Intel® HD Graphics and select "Try to connect anyway on VGA" from Multiple displays" dropdown.
Click Apply button before making any additional changes.
Select your main display and select "Extend these displays" from Multiple displays dropdown.
Click Apply button and Keep changes.
Your displays setup should look similar like on the picture below. Click OK button to close Screen Resolution settings.
You have now enabled the onboard integrated HD Graphics, and should be able to select Intel QuickSync in your video conversion software when converting to MP4.