It is impossible (currently) to get two HD-HSDI inputs into a laptop and so they need to be multiplexed either side-by-side or over/under.
You can use the AJA Hi5-3D or the Blackmagic HDLink Pro 3D  into the chosen HD-SDI capture port. 
Cel-Scope3D will work with dual-stream, side-by-side or over/under formats as well as S3D files.

Imperx HD-HDI Express card (check Laptop has Express Card slot)

Blackmagic UltraStudio : The has both HD-SDI, HDMI and analog inputs.
Check chosen laptop is approved type by Blackmagic and has USB3 port and the latest Renesas drivers installed. Sandybridge chipset laptops generally seem to work OK with UltraStudio

2 x IEEE Firewire can be used but 2nd port must be on Express card 
Needs HDV outputs from cameras or converter boxes HD-SDI to Firewire.

Some laptop model have a HDMI input port: check specs this supports 1080 HD formats

Sandybridge chipset recommended

Windows XP (any), Vista (any) or Windows 7 (any) 32 or 64 bit versions

Quad Core (or more) CPU Intel i7  930, 970,940,980X etc i7-2630QM etc
i5 or core Duo processors will run, but be significantly slower on HD media

3GB or more as fast as possible

2GB Free hard-disk space
-

Must be NVidia, Fermi based design preferred eg:
GTX485M, GTX580M, GTX480M, GTX460M, 2 x GTX485M
also suitable but slower:
GTX260M etc.
note: latest NVidia drivers must be installed