I have that entire 1968 test, 2 hours, but its pretty average, but its what was broadcast at the time. There's always snippets of stuff from most WI home series around pre-89, but its always just that, and usually poor quality. The 86 England tour wouldve been great to watch if it was done properly.
There is footage of the 85 NZ tour on the Viv Hitting Across The Line video.
Even that 1980 Holding over is so average, one camera. No way was that actual broadcast quality. When India toured in 89 the quality just went up to proper levels, and got better the following year when England toured and Sky took over. I guess the WI tv stations just didnt care or not have the resources to do it properly.