I agree that no film/photo is going to "prove" anything, but I do believe that video in the right setting would be enough to spur further research on the topic. The following scenario is one that I have put forth before. I am sure that there are a lot of others that would work just as well.
The President is going to give an important policy speech on conservation/natural resources/national parks/the DOI/etc. He/she elects to do it in a National Park to drive home the point of the speech. It is televised live on the cable news networks and the major media players are there to cover it. The President will deliver the speech from a stand in front of a large, pasture-like setting. There is forest on one side of the pasture and the base of a mountain on the other. A river runs through it. The distance between the forest and the base of the mountain is around 600 meters. The pasture, while appearing to be relatively level, actually has many small dips, hills, and large rocks hindering movement across it.
Midway through the speech, around 1000 meters behind the President's podium, a single buck rushes from the forest, followed very closely by a big, black, hairy thing on two legs. Shortly after entering the pasture, the thing catches the buck, wrestles it to the ground, and swiftly kills it with one blow to the head. It then gets up, and picks up the buck with one hand, and heads towards the mountain, carrying the deer over one shoulder. Some in the crowd gasp. The Secret Service having watched the whole thing, already has four SUV's enroute to the area as it appears someone has breached perimeter security. Four Secret Service agents surround and quickly escort the President to Marine One, which is waiting just over 50 meters away. The thing, seeing the crowd and the oncoming vehicles begins running towards the mountain. It crosses the waist deep river rapidly and without problem. The thing quickly reaches the base of the mountain and heads into the woods that start approximately 50 meters up the 60 degree slope. The thing climbs the steep mountainside with no apparent effort, still carrying its trophy. The time from the creature's first appearance out of the woods to disappearing into the woods on the other side is 37 seconds. The news cameras have caught the majority of this on tape. One lucky cameraman and director, succumbing to boredom, was panning the countryside during the speech and happened to have caught the buck emerging from the forest. They were able to zoom in and get crystal clear video of the entire sequence. WIthin an hour, the film has surpassed the Patterson-Gimlin Film in notoriety and viewers. Within a week, it had become the most watched piece of footage of all time.
Due to the roughness of the terrain, it takes the Secret Service two minutes to arrive at the location where the thing started up the slope. As they get there a dozen or so agents pile out of the vehicles, with what appear to be miltary style weapons, and start scampering up the slope. It is steep and they have considerable trouble navigating the rough terrain. After three minutes the majority of them make the tree line and enter the mountain forest. Four seconds later, a bloodcurdling, horrific scream is heard, somewhat like a cross between a woman being murdered, a baby crying, and a bull roaring. The scream is impossibly loud, even to those back at the stand, and deep. At that point, the crowd sees the pursuing agents running for their lives back down the slope, tripping and falling as they do. The remaining agents at the vehicles, have weapons drawn, pointing up towards the woods. It only takes a few seconds for the agents to descend the slope and take refuge by the SUV's. Quickly eight more SUV's proceed towards the location. However, nothing further is heard, only the faint odor of garbage, feces, and skunk remains in the area. After calling in reinforcements to conduct a search, nothing is found except broken tree limbs and a trail where it appears something large has rapidly traversed through the forest like a locomotive. A few bits of hair are found, but cannot be linked to any known animal. This trail ends in a nearby valley. Tracking dogs called in to assist refuse to go any further. Professional trackers cannot find the trail in the valley. After a week of air and land searches, the effort is given up. Three days later, Congress passes and the President signs, the Unknown American Creature Act (UACA), allocating $100 Million dollars to the Smithsonian to research and capture a speciman of whatever it was that eluded the Secret Service. Researchers later determined that the river was six feet deep at the point where the thing crossed it, waist deep.
Thus ends my creative writing assignment for the day! It would probably take something of this magnitude to quell any criticism of the video and be recognized as legit. The video would have to show superhuman feats and be in a situation where hoaxing was extremely unlikely. I am not going to hold my breath waiting for that video to show up....
My personal guess is that one will become a tractor-trailer hood ornament and that will be that.
And if anyone wants to take this seed of an idea and make a book or movie out of it, feel free to do so. I will gladly accept a percentage of the royalties!