No. High resolution images are not necessary for increasing the temporal resolution of the video.
The cricket(@6:50) and soccer(@7:51) results in the video did not involve any photographs.

Recently there was also a paper at Siggraph 2009 which specifically dealt with the problem of increasing video frame-rate:
"Moving Gradients: A Path-Based Method for Plausible Image Interpolation"
www1.cs.columbia.edu/~dhruv/

The paper showed a couple of examples captured by putting a video camera next to a point and shoot. These examples were meant to be an evaluation of our system on real-world data. The one of these examples can be seen at the very end of the video - @ 8:04.

Also, the experiments involving low-res material derived from high-res material is a realistic test case for hybrid cameras. These cameras can simultaneously capture low-res video with a few photographs every so often. Now you have the problem of converting the lowres-video into high-res using the intermittent photos that do not match perfectly in spacetime when the camera and the scene objects are moving. This is exactly the problem we address in this paper. To test our system we take a high-res video, down-sample and add noise to simulate low-res video and keep a few of the high-resolution frames from the original video to simulate the photographs. Then we compare our reconstruction to the original video and see what the error rate is.