You need an external recorder. The 7D MKII outputs recordable clean 1080p HDMI output with Audio.
The least expensive and best external recorder for the 7D MKII us this one (which doubles as an extra monitor)
-Atomos Ninja 2
http://atomos.com/ninja/
-Blackmagic Video Assist
https://www.blackmagicdesign.com/products/blackmagicvideoassist
The Atomos records to very affordable harddrives and SSDs and the Blackmagic records to SD cards. Both will allow you to record continuously until the card/drive is full without stopping at 29 minutes like the 7D mk II internal recording.
An external recorder is a very useful addition to any DSLR video shooter, it gives a bigger screen with focus and exposure assist (Peaking/zebras/waveforms), records for unlimited durations, and records to a better codec (Apple ProRes) vs internal (H.264). Aside from marginally better quality of the ProRes codec files, the other benefit is that they are much less processor intensive on computers, so even if you use a 6-7 year old machine you'll be able to edit and cut ProRes files fluidly while with H.264 you need a stronger machine otherwise it will struggle.