When you run OCAM, the following window pops up and you can learn briefly about each function.

Record
-Only screen recording or sound can be recorded.

Capture
-Capture your screen or game screen.

Resize
-Adjust the size of the recording area.

Open
-Open the folder where recorded video, recorded sound and captured image are saved with Windows Explorer.

Codecs
-Select the codec you want to use when recording.
Basically, you can use Ocam's built-in codec, hardware codec like NVIDIA NVENC, and VFW (external codec).

Sound
-You can set whether to record only the system sound, record the microphone together or not record the sound.

Game recording
-If you want to record the game, click the Record Game button. If the Record Game button is activated, you can record the game by activating the game window and pressing the Record shortcut key.