Is the HP Pavilion 27-ca2007a good for gaming?

Only for light or older titles at low settings. It relies on Intel UHD 770 integrated graphics, so demanding games will run poorly. A desktop with a dedicated GPU is the better choice for gaming.

Can I use the screen with my work laptop?

Yes. The HDMI-in port lets you plug in a laptop, console or streaming stick and use the 27-inch display as a monitor. You switch inputs without shutting the PC down.

Does it have a touchscreen?

No. The 27-inch FHD display is a standard non-touch panel.

Can I upgrade the RAM or storage later?

All-in-ones are harder to open than towers. The 32 GB of RAM and 1 TB SSD are generous from the start, but plan on the configuration you buy rather than upgrading later.

What comes in the box?

The all-in-one unit, a wireless keyboard and mouse combo, and the power adapter. A webcam is built in, so no separate camera is needed.

Is it good for video editing and photo work?

It handles photo editing and casual video editing well thanks to the Core i7 and 32 GB of RAM. The 1080p screen is the limit for color-critical work, and heavy 4K editing will feel slow without a dedicated GPU.