Console should be enabled by default. If not, you can do the following:
- Right click on Crysis in your Steam Library
- Select "Properties"
- Go to "Set Launch Options"
- Enter the following:
and press OK.

The console can now be opened ingame with the ~ key.

• Open the console.
• Type:
and hit Enter
This will lift any restrictions on console commands

The HUD should now be disabled.

Enable HUD again by typing

If you want to change the Field of View (FOV), type:

This is important:

To hide your weapon completely for screenshots, simply select your fists by pressing 4. After a few seconds,they will disappear automatically.